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  enigma
     Dolomite Problem and Precambrian Enigma
     “白云岩问题”与“前寒武纪之谜”研究进展
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     Enigma of China":Theory and Empirical Analysis Based on China
     中国之谜":理论及基于中国的经验分析
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     A UNFATHOMABLE ENIGMA OF CHROMOSOME GENETICS: B-CHROMOSOME
     染色体遗传中的一个不解之谜─—B染色体
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     The enigma of the Arthur's Pass, New Zealand, earthquake 2. the aftershock distribution and its relation to regional and induced stress fields
     新西兰阿瑟山口地震之谜——2.余震分布及其与区域应力场和诱发应力场的关系
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     The Analysis of NonLinear Phase Characteristics of Service Industry:An Explanation of Enigma of Development of Service Industry in China
     服务业发展的非线性阶段性特征分析——中国服务业发展之谜的一种解说
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  “之谜”译为未确定词的双语例句
     Uncover the Secret of "a=1.37m/s~2"
     揭开“a=1.37m/s~2”之谜
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     A New Approach to the Mystery of Man and Culture
     饮食人类学:求解人与文化之谜的新途径
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     Thus the essence of value pursuit is the pursuit of human nature,and the riddle of value is that of mankind.
     因而价值追求本质上是人对人的本质的追求,“价值之谜”实际上是“人之谜”。
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     Results of a new method to measure the S 17 (0) factor of the 7Be(p,γ) 8B reaction,which is essential for studying the missing solar neutrino puzzle,are described.
     介绍对研究太阳中微子丢失之谜有重要意义的7Be(p,γ)8B反应S17(0)因子的一个新的测量方法与测量结果
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     The Mystery Over 1/f Noise
     1/f噪声之谜
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     Riddle of Being
     生
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     The Enigma of Easter Island
     复活节岛
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  enigma
In order to resolve the prion enigma in neuroscience, it is suggested that both technical and concept barriers remain to be crossed.
      
The cause of neuronal cell death in Parkinson's disease is still an enigma.
      
We conclude that a phylogenetic comparison of behavior of a wide range of ungulates and other mammals will be needed to solve the enigma of sexual segregation.
      
Given the prevalence of extra-pair paternity, an enigma exists in non-mate-guarding species in which males have no apparent means of assuring their paternity and yet rarely or never lose paternity.
      
Saving Private Ryan: Realism and the Enigma of Head-Wounds
      
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The natural vegetation of Shantung Province, in the north temperate zone, is of the aestisilvae type. As the natural conditions vary in different parts of this province, the vegetation may be divided into the following four regions: 1. Alluvial plain of the Yellow River: This region is located at the northern part of this province. The saline soil is unfavorable for the growth of most plants. The following plants are characteristic: Tamarax chinensis, Apocynum venetum, Suaeda salsa, S. glauca, Artemisin capillaris,...

The natural vegetation of Shantung Province, in the north temperate zone, is of the aestisilvae type. As the natural conditions vary in different parts of this province, the vegetation may be divided into the following four regions: 1. Alluvial plain of the Yellow River: This region is located at the northern part of this province. The saline soil is unfavorable for the growth of most plants. The following plants are characteristic: Tamarax chinensis, Apocynum venetum, Suaeda salsa, S. glauca, Artemisin capillaris, Aeluropus littoralis, Miscanthus sinensis, Phragmites karka, Carex sp. etc.. 2.Western Shantung plain: This region is located at the western part of the province. Most of the land is under cultivation and the soil is rich in calcium. There is no forest. The common trees are Populus tomentosa, P. alba P. davidiana, Ulmus spp. etc., and the herbaceous plants are Cynodon dactilon, Digitaria sanguinalis, Echinochloa colonum, Imperata cylindrica, Chenopodium album, Convolvulus chinensis,Xanthium japonicum, Crypi saculeata, Scirpus maritimus etc.. Plants which grow in the lake district largely belong to Phragmites communis, Scirpus maritimus, Zizania latifolia, Euryale ferox, Trapa bispinosa etc.. 3.Central South hilly region: This region has mostly been transformed into farms for a long time. On the hilly region there are still some remnant forests. The important trees are Pinus tabulaeformis, Biota orientalis. Quercus acutissima, Q. variabilis, Betula chinensis, Tilia mongolica etc.. On account of calcareous soil in this region, Biota orientalis is found most extensively. Gramineae leads all other herbaceous plants in abundance. The following species such as Arundinella amomala, Bothriochloa ischaemum, Setaria viridis, Pennisitum flaccidum etc. have a wide distribution. 4. Shantung Peninsula: The common native plants in this region are Pinus densiflora, Quercus dentata, Q. acutissima, Robinia pseudoacacia, Acer mono etc.. Pious densiflora is a native plant which grows all over the hilly region. Herbaceous plants are mostly Thymus serpyllum, Setaria viridis, S. lutescens etc.. Due to the oceanic climate with higher precipitation and humidity, plants enjoy a more vigorous growth than those in other regions. There develops a richer flora, some even with warm temperate elements.

山东省之位置属于温带,植物分布为落葉闊葉林區,但在鲁中南及膠東區爲丘陵地带,落葉闊葉樹乃與針葉樹成混交林澑鶕∧谥匀粭l件,可将植物分布情况列為四區: 1.黃河冲積平原區:位於北部,為黄河三角州地帶,土壤含鹽分甚重,不宜於植物之生長。樹木只有檉柳、茶棵子等;草本以黄鬚菜、鹼蓬、茵陳蒿,獐毛、芒、蘆葦、黑三稜草等最為砇姟?2.魯西平原區:為西部之黄河冲積平原,多為農田,土壤含鈣甚多。區內無森林,常見之樹木有毛白楊、白楊、山楊、榆等?荼居泄费栏ⅠR唐、芒稷、白茅、藜、旋花、蒼耳、隱花草、荆三稜等。湖泊區域多蘆葦、荆三稜、蒲姜草、芡、菱等。3.魯中南區:為丘陵地區,平緩部分已闢為農田。山區有殘留森林,主要樹種為油松、侧柏、麻櫟、栓皮櫟、堅樺、椴等;土壤石灰質,側柏之繁盛為共特點。草本以禾本科為最多,常見的如野古草、白羊草、狗尾草、白草等,此外如細葉莎草、雞眼草、蚊子草等亦為砇姟?4.膠東區:在山東半島部份,主要樹種為赤松、洋槐、麻櫟、五角楓等,赤松自山麓至山上均有分佈,且為其鄉土,此乃本區之特徵;草本以蚊子草、狗尾草、金狗尾草為最多。在海灘地上少有高大樹木,常見樹種如洋槐、旱柳等均為栽培者,野生木本植物有酸棗...

山东省之位置属于温带,植物分布为落葉闊葉林區,但在鲁中南及膠東區爲丘陵地带,落葉闊葉樹乃與針葉樹成混交林澑鶕∧谥匀粭l件,可将植物分布情况列為四區: 1.黃河冲積平原區:位於北部,為黄河三角州地帶,土壤含鹽分甚重,不宜於植物之生長。樹木只有檉柳、茶棵子等;草本以黄鬚菜、鹼蓬、茵陳蒿,獐毛、芒、蘆葦、黑三稜草等最為砇姟?2.魯西平原區:為西部之黄河冲積平原,多為農田,土壤含鈣甚多。區內無森林,常見之樹木有毛白楊、白楊、山楊、榆等?荼居泄费栏ⅠR唐、芒稷、白茅、藜、旋花、蒼耳、隱花草、荆三稜等。湖泊區域多蘆葦、荆三稜、蒲姜草、芡、菱等。3.魯中南區:為丘陵地區,平緩部分已闢為農田。山區有殘留森林,主要樹種為油松、侧柏、麻櫟、栓皮櫟、堅樺、椴等;土壤石灰質,側柏之繁盛為共特點。草本以禾本科為最多,常見的如野古草、白羊草、狗尾草、白草等,此外如細葉莎草、雞眼草、蚊子草等亦為砇姟?4.膠東區:在山東半島部份,主要樹種為赤松、洋槐、麻櫟、五角楓等,赤松自山麓至山上均有分佈,且為其鄉土,此乃本區之特徵;草本以蚊子草、狗尾草、金狗尾草為最多。在海灘地上少有高大樹木,常見樹種如洋槐、旱柳等均為栽培者,野生木本植物有酸棗、舖地胡枝子等;草本植物多蘆葦、狗尾草等。此區氣候由於受篞笳{節,雨量與溼度亦較高,故植物生長較其他三區繁盛,種類亦較多,亞熱带植物之分布亦多於他處,尤以海邊低地為甚。在自然地理上,秦嶺、淮河一線是中國南北氣候和土壤的重要分界線,也是植物的重要分界線。但是從山東的植物分布上,可以知道這條線並不能絕然的将植物分為南北二部分,因為山東仍是一个過渡的地帶,許多南方植物在魯南及膠東沿海都有分佈,如黄檀、山胡椒、烏桖、厚朴、王蘭、木犀、黄楊、谜葉樹等多种。在另一方面,北方植物分佈至山東為其最南界限者如糠椴、遼珍珠梅、遼磯松、榛等;而赤松、蒙古機、蒙椴等則南达苏北之雲台山。由此可加,山東之植物分佈上,仍在秦嶺、淮河一線之範圍内,如以淮河來作為植物之南北分界線,则并不能完全符合實際情况,尤以膠東沿海低地,南方植物種類繁多,可與淮河流域相此。因此,此一分界线之東端似有北移之必要。山東植物之分佈乃由環境条件综合影響之結果,但在不同地区,各種因素之作用並不一致,由於地形、土壤、温度和水分等之区别而使植物分布不同。本文所举植物種类和分布地點都是從各項资料所得到,作者将其分為四區,並初步提出了這種分区的理由和形成不同分布的原因。但限於材料的不够完全和水平的淺薄,因此本文的內容很不充實, 只能作为令後进一步研究山东植物地理的基础,希望大家提出补充和指出不正确的地方,而使这一项工作能够顺利的完成。

In recent years,a new disease of the foxtail millet (Setaria italica (L.) Beauv.)has been reported to occur in epiphytotic scale in most of the millet growning areasof North China.On account of the brilliant red pigmentation of the infected plant,the disease is generally referred to by the farmers as the red-leaf disease.However,the symptoms on the millet plants varied with different varieties.In general,thecharacteristic symptom exhibited on the "purple-stem" varieties was the the redden-ing of the leaf blade,leaf...

In recent years,a new disease of the foxtail millet (Setaria italica (L.) Beauv.)has been reported to occur in epiphytotic scale in most of the millet growning areasof North China.On account of the brilliant red pigmentation of the infected plant,the disease is generally referred to by the farmers as the red-leaf disease.However,the symptoms on the millet plants varied with different varieties.In general,thecharacteristic symptom exhibited on the "purple-stem" varieties was the the redden-ing of the leaf blade,leaf sheath and spike,particularly the bristle,while that onthe "green-stem" varieties was the yellowing of the leaf blade.In all instances,thediscoloration was usually accompanied by shortening of internode,stunting of thewhole plant.wrinkling of leaf surface,slight waviness of leaf margin,deformationof spike and underdevelopment of root systems.Plants infected at an early stagewere severely stunted and on heads were produced. It has been demonstrated that the red-leaf disease of the foxtail millet was causedby a virus readily transmitted by at least three different species of grain-infestingaphids:corn aphid,Rhopalostiphum maidis Fitch;grain aphid,Macrosiphum granari-um Kirby;and green-bug,Toxoptera graminum Rond.Tests with non-viruliferouscorn aphid eliminated the possibility of direct aphid injury as the cause of the disease. ??The virus was not transmissible by mechanical inoculation,by seeds nor through thesoil. Studies on the mode of transmission of red-leaf virus by corn aphid indicatedthat the virus was persistent in its insect vector and could infect in succession aseries of at least 27 tested millet seedlings.The aphid was unable to acquire thevirus in a 5-minute feedling period on the virus source but was able to pick up thevirus in 10-minute period.The 8-hour acquisition feeding period was optimum forthis aphid.The testing feeding period was found to be not more than 5 minutesand a 4-hour period of confinement on the diseased plant was ample for the aphidto cause maximum infection.Attempts to transmit the virus with cotton aphid.Aphisgossypii Gloner peach aphid,Aphis persicae Sehult and soybean aphid,Aphis glycinesMats,have given negative results.The incubation period for symptoms of the red-leaf virus in foxtail millet ranged from 10 to 32 days with the model period beingbetween 14 to 20 days. Under natural conditions,certain cultivated cereals and grass weeds showed thesymptoms resembling the red-leaf disease of foxtail millet.Among them,were ZeaMays L.,Panicum miliaceum L.,Setaria lutescens (Weigel) Hubb.,S.viridis (L.)Beauv.,Digitaria sanguinalis (L.) Scop.Echinochloa crusgalli (L.) Roem.,Eragrostiscilianensis (All.) Link,E.pilosa (L.) Beauv.,Arundinella anomala Steud,Spodiopogonsibiricus (Steud.) Trin.,Bothruochloa ischaemum (L.) Keng.,Capillipedium parviflor-um (R.Br.) Stapf and Poa practensis L..Artificial inoculation with the corn aphidproved that the first six named plant species,including the two cereals,were susce-ptible to the red-leaf virus and they produced,in all cases,the typical symptoms.Tests with the rest sexen grass weeds are in progress. The results of disease control experiments by timely spraying with an insecticide,E605,under field conditions were inconsistent.Among the 349 foxtail millet varie-ties of foxtail millet examined in the experimental field,nine of them were foundto be highly torelant to and suffered only very slightly from the attack of the red-leaf virus.These varieties were,however,succeptible in aphid transmission experiments. Available evidences point to the conclusion that the red-leaf virus of the foxtail millet herin reported is quite different from all the previously described cereal viruses.Among the cereal virus that closely resembles the red-leaf virus is the yellow-dwarfvirus reported by Oswald tnd Hauston.These two viruses are similar in the follow-ing respects:both are transmissible by the same species of aphids (Rhopalosiphummaidis,Microsiphum graminium andToxoptera granarium) and neither virus can betransferred mechanically.But they differ strikingly from each other in their hostranges.According to Oswald and Hauston,there were 19 of 55 grasses tested thatappeared to be immune from the yellow-dwarf virus.Digitaria sanguinalis,Echino-chloa crus-galli Setaria viridis and Zea Mays were among the immune hosts.On thecontary,all these four gramineous plants were found to be extremely susceptible tothe red-leaf virus both under natural condition and in artificial inoculation experi-ments.Accordingly,the red-leaf,a persistent aphid borne virus affecting the foxtailmillet,is herein reported as a new virus of the cereals.

小米红叶病是在我国华北分布普遍和为害严重的一种小米病害。病害的症状,在紫杆的小米品种上面,主要的是叶片、叶鞘和穗变紅;在青杆品种上面是叶片黄化。無論如何,紫杆和青杆品种病株除变色外,都可随伴各种畸形,包括植株矮化、叶面绉折、叶綠波状、穗变形和根系發育不良。紅叶病是一个借蚜虫傳播的病毒病害衩籽痢⒙蟪す苎梁吐蠖硌辆軅鞑ゲ『?其中以玉米蚜为最重要。曾經测定玉米蚜在病株上面吸食获得病毒和在健株上面吸食所需最短的时間;带毒玉米蚜的数目和傳病效能的关系谐嵫梁腿舫婢軅鞑 S锰已痢⒋蠖寡梁兔扪羵鞑∥椿竦谜慕Y果。紫杆品种感病后,仅表皮細胞、叶毛細胞和泡状細胞变成紅化,其下层的組織不紅化。叶綠素逐漸消失,但消失过程相当的慢。在病害最末期,維管束內的靱皮細胞少数的坏死,导水管內可能充塞有棕色胶質物,其它細胞無显著的变化。檢查病叶未發現有細胞內含体。用带毒蚜虫作人工接种,証知小米紅叶病病毒能侵染玉米和黍。这两种作物在自然环境下均發生紅叶病。在自然环境下,有以下的禾谷类杂草紅化:金狗尾、青狗尾、馬唐、大画眉草、画眉草、稗、野牯草、大油芒、白羊草、細柄草和六月禾。用玉米蚜作人工接种証明稗、青狗尾、金狗尾、馬唐、六月禾和大油...

小米红叶病是在我国华北分布普遍和为害严重的一种小米病害。病害的症状,在紫杆的小米品种上面,主要的是叶片、叶鞘和穗变紅;在青杆品种上面是叶片黄化。無論如何,紫杆和青杆品种病株除变色外,都可随伴各种畸形,包括植株矮化、叶面绉折、叶綠波状、穗变形和根系發育不良。紅叶病是一个借蚜虫傳播的病毒病害衩籽痢⒙蟪す苎梁吐蠖硌辆軅鞑ゲ『?其中以玉米蚜为最重要。曾經测定玉米蚜在病株上面吸食获得病毒和在健株上面吸食所需最短的时間;带毒玉米蚜的数目和傳病效能的关系谐嵫梁腿舫婢軅鞑 S锰已痢⒋蠖寡梁兔扪羵鞑∥椿竦谜慕Y果。紫杆品种感病后,仅表皮細胞、叶毛細胞和泡状細胞变成紅化,其下层的組織不紅化。叶綠素逐漸消失,但消失过程相当的慢。在病害最末期,維管束內的靱皮細胞少数的坏死,导水管內可能充塞有棕色胶質物,其它細胞無显著的变化。檢查病叶未發現有細胞內含体。用带毒蚜虫作人工接种,証知小米紅叶病病毒能侵染玉米和黍。这两种作物在自然环境下均發生紅叶病。在自然环境下,有以下的禾谷类杂草紅化:金狗尾、青狗尾、馬唐、大画眉草、画眉草、稗、野牯草、大油芒、白羊草、細柄草和六月禾。用玉米蚜作人工接种証明稗、青狗尾、金狗尾、馬唐、六月禾和大油芒均感染小米紅叶病病毒。其它紅化杂草和接种試驗,正在进行中。紅叶病病毒对小米植株所产生的影响,因植株發育的阶段不同而輕重有所差异,植株感病愈早病害愈剧烈。用杀虫剂E605在田間噴射小米防治紅叶病,未能表現药剂有防病的效能,在田間观察349个品种,选得9个高度耐病和农艺性状优良的品种。抗病选种可能是当前防治小米紅叶病最有效的防治措施。根据病原的傳染方法,寄主范围和所表現的症状,小米紅叶病病毒和以往所报道的禾本科植物的病毒病害的病毒均不相同,因此它是禾谷类作物的一个新的病毒。

With the sharp political struggle of the late Qing Dynasty,it brought about various hearsays and conjectures and became an unfathomable enigma for a while that the Emperor Guang Xu died in the day before the death of the Empress Dowager Ci Xi.This article answers the unsettled question of the un- expected death of the Emperor Guang Xu.

清代末期政治斗争激烈。光绪死于慈禧病故的前一天,引起多种传说猜测,成为一时难解之谜。本文揭示了光绪突然死去的谜底。

 
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