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  hurdle
     On combined training in 400 m and 400 m hurdle
     高校田径队400 m与400 m结合训练探讨
短句来源
     Analysis and Training about the Technique of 400m Hurdle Race
     400m技术分析与训练
短句来源
     The average maximum speed of the world men's excellent 400m hurdle runners appears in the section of the 2th hurdle and the 3th hurdle from 80m to 120m;
     世界优秀男子400m短跑运动员平均最高速度产生在第2到第3段落80m到120m,然后逐渐下降;
短句来源
     Research on arm swing in 110 hurdle and Coordination of Arm and Leg
     析110米跑过时的摆臂及腿臂动作配合
短句来源
     Linear Regression Analysis between 110m Hurdle and 100m Sprint Results of the Excellent 110m-Hurdle Sprinter
     男子优秀跨运动员110m成绩与100m成绩的线性回归分析
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  hurdles
     A Study on the Speed Distribution in Men's 400m Hurdles Running in 2000 Olympic Game
     2000年奥运会男子400m跑速度分配的特征研究
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     The Discussion on the Retilinear Character of the Modern Skills of the 110M Hurdles
     略论110m现代技术的直线性特征
短句来源
     4.His average speed is 9.20m/s and reaches the highest (9.63m/ s)between the hurdles of No. 4-No.
     刘翔间的3步平均速度快(9.20m/s),在第4~5间达到最高速度(9.63m/s);
短句来源
     Technical feature analysis of attack into the hurdle stage of the 5th hurdle of 110 metres hurdles of LIU Xinag
     刘翔110米第5蹬伸阶段技术特征的剖析
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     Technical Training of 400m Hurdle Race and the Rhythm Among Hurdles
     400米跨跑的技术训练及间节奏管窥
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  hurdlers
     Main Factors of Influencing the 110m Hurdle Race Performance of Man Hurdlers
     影响男子110m成绩的主要因素
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     Evaluation and Analysis on Kinematic Characteristics of 400 m Hurdlers
     400m运动特征的分析和评价研究
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     A Comparative Study on the Prominent 110m Hurdlers’ Stride and 100m Sprinter’s Single Stride
     110m优秀运动员跨步与100m运动员单步技术的比较研究
短句来源
     Grey Comparative Analysis Between First And Fifth Hurdle's Speed of Hurdle Step for Some Excellent Hurdlers of Man's 110m Hurdle Race in Our Country
     我国部分优秀男子110m运动员第1与第5的跨步速度的灰色优势比较分析
短句来源
     Analysis of Result Changes of the Best 110-Metre Hurdlers in the World
     世界优秀男子110m运动员成绩变化分析
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  th hurdle
     The average maximum speed of the world men's excellent 400m hurdle runners appears in the section of the 2th hurdle and the 3th hurdle from 80m to 120m;
     世界优秀男子400m短跑运动员平均最高速度产生在第2到第3段落80m到120m,然后逐渐下降;
短句来源
     Technical feature analysis of attack into the hurdle stage of the 5th hurdle of 110 metres hurdles of LIU Xinag
     刘翔110米第5蹬伸阶段技术特征的剖析
短句来源
     and then decrease step by step,the obvious slow-down happens in the 7th hurdle and 8th hurdle;
     速度明显下降发生在第7到第8处;
短句来源
     It has been shown that the speed of world elite men's hurdlers from 3rd to 5th hurdles is the fastest and stable. They began to speed down gradually from the 6th hurdle and the speed is the slowest before the 9th hurdle. They began to speed up from the 9th to 10th hurdles and sprinted to the end line.
     结果表明,世界优秀跨跑运动员在第3~第5间速度最快,并保持稳定,从第6后开始逐渐减速,至第9前速度达最小,在第9到第10间又出现加速,然后冲刺至终点;
短句来源
     the quickest hurdles speed appears foreword 3rd hurdle postpones to the 6th hurdle.
     最高间速度出现的序第3向第6推迟。
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  hurdle
The rapid and massive death of transplanted cells after MT is considered as a major hurdle which limits the efficacy of MT treatment.
      
The new hurdle: The prospects for Polish and Estonian accession to 'Pillar III' in the post-Tampere European Union
      
Therefore, this technique allows the production of transgenic legumious plants without the need for in vitro tissue culture, often a major hurdle with this family.
      
Atrial fibrillation (AF) remains an unsurmounted hurdle toward the cure of supraventricular arrhythmias.
      
Who gets over the training hurdle A study of the training experiences of young men and women in Britain
      
更多          
  hurdles
From these parallel paths we are learning a number of useful lessons and have begun to visualize the hurdles to be overcome as we move these therapies forward.
      
However, the "road to success" has not been without hurdles.
      
Efforts have been made to highlight the limitations and missing directions of the research and development in the spoken language technology which are creating hurdles in the development of voice-active robots for real-world applications.
      
One of the major hurdles that needs to be overcome is the establishment of law and order throughout the country.
      
Such a strategy is still hampered by many hurdles of which random integration of therapeutic DNA is a major safety concern.
      
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  其他


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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...

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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。

This paper is to discuss the properties of high order aberrations taking advantage of as much as possible of using the methods of approximation. The number of independent terms of secondary aberrations is first accessed and its geometrical significance ascertained. By a coordinate transformation the effects of the change of stop position on aberration coefficients are determined. The relations between the position of the object and its aberration coefficients are found on the basis of Fermat principle, by regarding...

This paper is to discuss the properties of high order aberrations taking advantage of as much as possible of using the methods of approximation. The number of independent terms of secondary aberrations is first accessed and its geometrical significance ascertained. By a coordinate transformation the effects of the change of stop position on aberration coefficients are determined. The relations between the position of the object and its aberration coefficients are found on the basis of Fermat principle, by regarding each ray as emitting from different object points lying along this ray.

本文的主要目的在以近似方法讨论高级象差特性。首先由对称性讨论了二级象差的独立象差数,近似讨论了象差的几何意义,再由坐标变换的观点导出了光移动时象差变化的规律。由Fermat原理和同一光线可看作是各不同点发出的观点导出了物体移动时象差变化的规律。由于运用Fermat原理,所得的结果实际上是略去初级象差影响后的近似结果,因此表示式相当简单。 然后我们把象差产生的原因分为二类。其一称作是本徵的,是入射光束无象差时必然产生的象差,用象差看作球差的观点导出了它们的表示式,结果表明,高级球差和本徵轴外球差是象差产生的原因,并导出了各种象差同时产生的状况。象差的另一类称作是衍生的,它们是由入射光线原有象差引起的初级象差差异,由初级象差理论即可得出它们的表示式。这一些高级象差的规律和近似表示可作为评断象差产生原因的半定量依据。 最后,用Fermat原理讨论了高级色差问题,并说明Fermat原理之所以可在高级象差理论中应用的理由及不致误差过大的应用范围。

Aedes albopictus is one of the mosquitoes most often seen in Foochow, but itsecology is not entirely known. Therefore, I have spent a whole year in observing itsecology. The results of my observations are as follows: 1. Aedes albopictus is active in the day time. It is not easy to collect, but theyoften appear in the mosquito net, kitchen, pig sty, drawing-room and among weeds inthe fields. The seasonal distribution of Aedes albopictus covers a period from Marchto December with the highest peak in July, August...

Aedes albopictus is one of the mosquitoes most often seen in Foochow, but itsecology is not entirely known. Therefore, I have spent a whole year in observing itsecology. The results of my observations are as follows: 1. Aedes albopictus is active in the day time. It is not easy to collect, but theyoften appear in the mosquito net, kitchen, pig sty, drawing-room and among weeds inthe fields. The seasonal distribution of Aedes albopictus covers a period from Marchto December with the highest peak in July, August and September. 2. The daily activity of adult Aedes albopictus show two peaks outdoors, one inthe morning at 5--6 o'clock, and one in the late afternoon at 4--5 o'clock. Indoors,only a single peak, at about 1--5 p.m. 3. The breeding places of the larvae are widely distributed, consisting of small re-ceptacles like vats, cans, urns, etc., with water which is always of a light brownish col-our and with rotten leaves and silt at the bottom. The pH values of the water oftypical breeding places is 6.5--7.6, and the total organic nitrogen is 6--20 p.p.m. 4. The larvae of Aedes albopictus are found in most cases to breed alone, and arerarely found together with those of other insects. 5. The egg of Aedes albopictus hibernate for two months and a half in wintertrom middle of December to end of February. 6. The importance of Aedes albopictus in the transmission of Japanese B encephalitis virus is discussed.

本文系1959—1960年作者在福州地区进行的白纹伊蚊一年生态观察报告,其主要结论有:(1)白纹伊蚊成虫的栖息场所很多,在人房帐内、厨房、猪、客厅、郊野草丛等处都有采获。其月份消长,自3月出现,7—9月为高峰,12月下旬消失。(2)成虫白昼活动时间在户外呈现两个峰,一个峰在上午5—6时,另一个峰在下午4—5时;室内活动高峰在下午1—5时。(3)幼虫孳生地分布甚广,以雨后积水的容器为主,其月份消长情况与成虫的月份消长是相一致的。(4)一般所见幼虫孳生地水色多略呈淡棕,并常含有腐烂树叶及泥渣。发现幼虫孳生次数较多的孳生中的水的酸碱度为6.5—7.6,总有机氮含量为6—20p.p.m.。(5)白纹伊蚊幼虫多数是单生,少数与他种蚊幼或其他昆虫共同孳生。(6)白纹伊蚊是以卵越冬,自12月半至2月底,越冬期约二个半月。(7)对于白纹伊蚊与当地乙型脑炎的关系亦作出初步分析。

 
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