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     But now it is established combining Aug(1-7) with the specific receptors(AT5?)
     一般认为,脑内血管紧张素的功能是由ANGⅡ与AT1受体结合完成的,但目前认为,脑内正常心血管功能是由ANG(1—7)与其特异性受体(AT5?)
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     But now, inland CAPP drop behind CAD and CAM greatly, studies and applications on CAPP are obviously important.
     但目前国内CAPP 的发展和应用远远滞后于CAD 和CAM,因此,研究和应用CAPP 技术具有重要的意义。
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     But now our peasants are still excluded from the system of our national basic medicare security.
     但 目前我国农民仍被排除在国家基本医疗保障体系之外。
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     But, now there aren’t enough experimental findings for the study of short-pulsed dielectric breakdown in liquid to establish related theoretical frame, and there isn’t accepted formula to calculate the breakdown voltages of liquid dielectrics.
     但目前对ns级以及更快脉冲下液体介质绝缘特性的研究尚缺乏充足的实验数据,无法依据现有资料构建该时间量级下液体介质击穿的理论框架,且其击穿电压的确定尚无公认的计算公式。
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     IntroductionIt is a hot spot that the recovery of neural function after spinal cord injuries . The transplantation of neural stem cells is helpful to the recovery of the spinal cord. But now we concentrate on the neural stem cells in the striatum corpora and cort , not on the spinal cord derived neural stem cells.
     目的脊髓损伤后神经功能的恢复是目前的研究热点,神经干细胞(neural stem cells, NSCs)移植可有助于脊髓功能的恢复,但目前的研究多集中在纹状体和皮层的神经干细胞上,对脊髓源性神经干细胞的研究为数不多。
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     The feedback controller is a core technique of a scanning probe microscope(SPM),but the feedback of SPM using at the present time is usually based on analog circuit,therefore a feedback based on digital signal processor(DSP) possesses high practical value.
     反馈是扫描探针显微镜控制的核心技术,但目前SPM通常使用基于模拟电路的反馈,因而基于数字信号处理器的数字反馈控制器具有较高的实用价值。
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     But the theory and practice is scanty,especial in legislation on Water Right System.
     但目前我国与水权相关的理论研究与实践才刚刚起步,有关水权制度的立法更是薄弱,亟待完善。
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     μC/OSⅡ is widely used in enbedaed systems because of their real-time feature,but there is a few GUI for μC/OSⅡ up to date.
     在嵌入式系统中,μC/OSⅡ以其严格的实时性得到了广泛的应用,但目前适用于μC/OSⅡ的图形界面却很少.
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     The continuity of assembling rational Bézier spline curves or Bézier spline surfaces is often encountered in computer aided geometric design(CAGD).
     在CAGD中,常遇到有理Bézier样条曲线、曲面的光滑拼接问题,但目前却鲜见有关有理Bézier样条曲线、曲面光滑拼接问题的讨论。
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     However,there are many problems come to being in the process of protection and making use of the resourses.
     但目前保护利用中存在很多问题,其中遗迹破坏严重、资源利用率与资源占有量不协调等问题尤为突出.
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     目前X.
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     C.
     目前,C.
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     But W. H.
     H.
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     But the performance improvement is at the expense of computational complexity increment.
     H.
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     But the overuse of interventional therapy is also a problem.
     目前也出现了过度使用的问题。
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The genus Phyllobrostis Stgr., not found in Russia hitherto, was earlier referred to the subfamily Cemiostominae (Seksyaeva, 1981, 1994), but now many authors include it in the subfamily Lyonetiinae (Karsholt and Razowski, 1996; Leraut, 1997).
      
The patients were well educated and employed to the same degree up to the age of 40 years, but now at a higher age reported reduced general health.
      
This large hylid was formerly common on the east coast of Australia, but now occurs in only a few scattered localities where rising salt is one of a number of potential threats.
      
Seasonal mobility of this species was previously demonstrated by local studies, but now this mobility has been confirmed in two different canyon systems 100 km apart.
      
HC was once thought to be a rare headache disorder, but now many cases have been reported.
      
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Sugar cane borers infest the cane and cause a considerable injury to the plant in China. Four species of sugar-cane borers are commonly found in Kwangtung Province, viz. Diatraea venosata Wk., Chilo infuscatellus Snellen, Eucosma schistaceana Snellen and Sesamia inferens Wk.Trichogramma evanescens Westw. occurs in nature as an egg parasite of the sugar-cane borers.The present experiment on breeding Trichogramma centres around the ways of increasing its viability.The quality and the quantity of the nutrient for...

Sugar cane borers infest the cane and cause a considerable injury to the plant in China. Four species of sugar-cane borers are commonly found in Kwangtung Province, viz. Diatraea venosata Wk., Chilo infuscatellus Snellen, Eucosma schistaceana Snellen and Sesamia inferens Wk.Trichogramma evanescens Westw. occurs in nature as an egg parasite of the sugar-cane borers.The present experiment on breeding Trichogramma centres around the ways of increasing its viability.The quality and the quantity of the nutrient for the larvae and adults of Trichogramma play an important role in relation to their viability. The contents of the egg of Sitotroga cerealella Oliv. which has been commonly used as a host of the Trichogramma are of poor nutrient quality and quantity for the larvae of this parasite. The eggs of Angoumois grain moth are so small that only one adult Trichogramma emerges from each egg. Such adults are usually smaller in size, less active and with lower reproductive potentiality as compared with those that emerge from the field hosts; besides, the female sex ratio gradually decreases in the successive generations.From the results of an experiment on Trichogramma breeding, it is found that the eggs of Attacus cynthia ricini Boisd. and of Dendrolimus sp. are the most suitable hosts for the propagation of Trichogramma evanescens. The adults of the parasites emerging from such eggs are generally large in size, very active and possess high reproductive potentiality; besides, the female sex ratio remains unchanged in the successive generations. Evidently, the quality and the quantity of the egg contents of these two species of insects fulfil the nutritional requirements for the development of the Trichogramma larvae and they are recommended as hosts for Trichogramma propagationThe average number of adult Trichogramma emerging from a single egg of Dendrolimus sp. and that of Attacus cynthia ricini is 27.3 and 28 respectively with the respective maximum reaching 52 and 59 in the present record. If too many adults emerge from a single egg, both their size and reproductive potentiality would decrease and, moreover, the number of the male individuals would increase and the adult life would shorten. Undoubtedly, all these features are unfavourable for the utilization of the parasites for control of the insect pest as far as the effectiveness of the parasites is concerned. From the standpoint of increasing viability of the parasite, regulation of the number of parasites in the egg during the procedure of propagation of Trichogramma is necessary. Regulation of the number of parasites in the egg means regulation of the quantity of the nutrient for the parasites. The method of checking the occurrence of superparasitism is to regulate the ratio of the number of female Trichogramma and host eggs to 1:1 through the procedure of propagation; the period of oviposition should not exceed one day.The quality of nutrient for adult Trichogramma greatly affects its longivity and reproductive potentiality. The result of a nutritional experiment shows that honey is the most suitable nutrient for it. The adults fed with honey have the longivity increased 8.6 times and the number of the offspring 14.7 times as compared with those fed with distilled water.Cold storage effectively reduces the speed of development of the immature stage of Trichogramma. The mature larvae about to pupate within the host eggs maintain their life for 57 days under 4—7℃ and all of them will come out as adults at room tempeature. The fresh eggs of Dendrolimus sp. and of Attacus cynthia ricini kept in cold storage of 0— 4℃ for 97 days and 61 days respectively are still usable for rearing Trichogramma.In order to increase the adaptability of Trichogramma to the environment of the sugarcane field, the rearing procedure is suggested to proceed in the field or in an indoor environment with fluctuating temperature and humidity. The continuous artificial rearing should not exceed five generations before the liberation of the parasites.The distance of dispersion of Trichogramma eva

甘蔗是我国最重要的糖料作物,甘蔗害虫以甘蔗螟虫最普遍,分怖亦最廣。廣东珠江三角洲常见的甘蔗螟虫共有四种:条螟或称斑点螟(Diatraea venosata Wk.)、二点螟(Chilo infuscatellus Snellen)、黄螟(Eucosma schistaceana Snellen)和大螟(Sesamiainferens Wk.)。甘蔗螟虫为害的结果,形成枯心苗和蛀(?),影响甘蔗生长发育,减低蔗糖成份,易受风折,而且造成甘蔗赤腐病菌入侵条件。 甘蔗螟虫的为害虽重,但目前还没有一套完整的防治方法,也还没有一种很有效的方法。本试验目的,是利用赤眼蜂来防治甘蔗螟虫。试验内容是赤眼蜂的寄主的选择和繁殖、赤眼蜂的繁殖及保存、赤眼蜂田间放播初步试验和甘蔗螟虫田间发生情况的调查。现将各项试验结果简要地分述如下: 赤眼蜂能否利用成功,要看培育出来的赤眼蜂是否具有高度的生活力。赤眼蜂的生活力可用下列四个标准去量度:(1)蜂体大小,(2)繁殖能力,(3)成虫寿命,(4)对田间环境的適应性。此外,繁殖出来的赤眼蜂雌性此率不应此自然界的减低。 赤眼蜂的生活力,首先和寄主有很大关系。如果寄主卵的内含物的质和量...

甘蔗是我国最重要的糖料作物,甘蔗害虫以甘蔗螟虫最普遍,分怖亦最廣。廣东珠江三角洲常见的甘蔗螟虫共有四种:条螟或称斑点螟(Diatraea venosata Wk.)、二点螟(Chilo infuscatellus Snellen)、黄螟(Eucosma schistaceana Snellen)和大螟(Sesamiainferens Wk.)。甘蔗螟虫为害的结果,形成枯心苗和蛀(?),影响甘蔗生长发育,减低蔗糖成份,易受风折,而且造成甘蔗赤腐病菌入侵条件。 甘蔗螟虫的为害虽重,但目前还没有一套完整的防治方法,也还没有一种很有效的方法。本试验目的,是利用赤眼蜂来防治甘蔗螟虫。试验内容是赤眼蜂的寄主的选择和繁殖、赤眼蜂的繁殖及保存、赤眼蜂田间放播初步试验和甘蔗螟虫田间发生情况的调查。现将各项试验结果简要地分述如下: 赤眼蜂能否利用成功,要看培育出来的赤眼蜂是否具有高度的生活力。赤眼蜂的生活力可用下列四个标准去量度:(1)蜂体大小,(2)繁殖能力,(3)成虫寿命,(4)对田间环境的適应性。此外,繁殖出来的赤眼蜂雌性此率不应此自然界的减低。 赤眼蜂的生活力,首先和寄主有很大关系。如果寄主卵的内含物的质和量都適合 於赤眼蜂幼虫营养之需,羽化出来的成虫体积大,繁殖力强,寿命也有延长的趣势。关於赤眼蜂的寄主,我们管用过17种鳞翅目昆虫的卵供其寄生,结果以松毛虫(Dendro

It is now well-established that stress-induced micro-diffusion of carbon atoms in the interstitial lattice points will take place in body-centred cubic lattices such as in α-iron. This is the result of the lattice asymmetry introduced by an oscillating strain in the crystal. In a pure face-centred cubic metal, this phenomenon could not happen, namely, not in -γ-iron. Nevertheless experimental evidences show to the contrary.

在面心立方体金属中间隙原子一般不发生内耗。只有在合金元素(杂质)或空穴周围的间隙原子才会发生微扩散的内耗。因为空穴或合金原子的存在破坏了邻近间隙位置的对称性,在这样位置上的间隙原子才有可能在往复应力作用下发生应力感生微扩散内耗。 本文按以上所述两种情况,利用作者之一所作的内耗热力学理论作计算,发现由于合金原子存在而引起的内耗弛豫强度应该与x_A(1—x_A)·C成正比,x_A是合金原子浓度,C是间隙原子浓度。由于空穴存在而引起的内耗强度应与N·1/(B/C~2+1/C)成正比,此处N是空穴的浓度,C是间隙原子浓度,B是一常数。在葛庭隧、钱知强两氏对面心立方系锰钢的内耗强度的实验中,内耗强度的数值基本上与合金原子浓度无关。因此,在高锰合金钢中像是空穴所引起内耗的那种机构。同时,可以估计出碳原子落入空穴放出的能量约为0.14eV。但目前实验数据有限,实际上面心合金钢中是何种机构在起主要作用,尚待进一步研究。

By sublimation of NaCl crystals of high purity in vacuum at a temperature near its melting point single NaCl crystals of macroscopic size were grown at zones of somewhat lower temperatures. Oriented overgrowths up to 1 mm thick were obtained over the whole cleavage faces of the crystals, but the deposition was much

半个世纪以来,从NaCl的蒸汽生长其单晶体的企图并没有得到正面的结果,解理面上的取向性结晶也尚未有超过数个分子层者。对于从溶液结晶出来时NaCl晶面发展的顺序,或者相对的重要性的研究已有肯定的结果。关于晶核或生长驼峰发端的位置从几率上看应在晶面何处的时尚理论未能从NaCl自溶液中结晶出来的实验加以证实或否定。 为探索从蒸汽相生长NaCl单晶体的规律,本实验初步获得较大尺度的单晶体,并同时使取向性晶面上结晶达到1毫米以上的厚度。 升华蒸汽来源于高纯度的从熔融体结晶出来的单晶体,并使母晶和结晶基面保持在近于NaCl熔点的温度。蒸发和结晶系在放置于两相邻接的电炉中的真空石英管内的不同温度区域进行的。我们观察了结晶区域内各分区结晶的特征,以及管端造形对于晶体方位和粒度大小的影响。观察到晶面出现几率的顺序为100>111>120>122>110。其中111对于120的优势显然不如在溶液中结晶时那样肯定,但目前尚未得到足够的几率上的根据来倒易这个顺序。122为气成单晶上新发现的晶面。122面可能在三种情况下出现: a)以自然面的形式出现; b)做为晶体与其载荷基底或载荷晶面的接触面; c)在形成交互生长时与另...

半个世纪以来,从NaCl的蒸汽生长其单晶体的企图并没有得到正面的结果,解理面上的取向性结晶也尚未有超过数个分子层者。对于从溶液结晶出来时NaCl晶面发展的顺序,或者相对的重要性的研究已有肯定的结果。关于晶核或生长驼峰发端的位置从几率上看应在晶面何处的时尚理论未能从NaCl自溶液中结晶出来的实验加以证实或否定。 为探索从蒸汽相生长NaCl单晶体的规律,本实验初步获得较大尺度的单晶体,并同时使取向性晶面上结晶达到1毫米以上的厚度。 升华蒸汽来源于高纯度的从熔融体结晶出来的单晶体,并使母晶和结晶基面保持在近于NaCl熔点的温度。蒸发和结晶系在放置于两相邻接的电炉中的真空石英管内的不同温度区域进行的。我们观察了结晶区域内各分区结晶的特征,以及管端造形对于晶体方位和粒度大小的影响。观察到晶面出现几率的顺序为100>111>120>122>110。其中111对于120的优势显然不如在溶液中结晶时那样肯定,但目前尚未得到足够的几率上的根据来倒易这个顺序。122为气成单晶上新发现的晶面。122面可能在三种情况下出现: a)以自然面的形式出现; b)做为晶体与其载荷基底或载荷晶面的接触面; c)在形成交互生长时与另一晶体的100面为共面。 本实验发见一种新的规律性的插生关系,它与自溶液中结晶出来的NaCl晶

 
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