到目前为止

But up to now, little is known about the mechanism of organogermanium compounds and organotin compounds.

但是，到目前为止，对于有机锡和有机锗的抗癌、抗病的机理还不十分清楚。

Although itsapplication in organic synthesis has extented rapidly, a survey of literature showsthat CuCN·2LiCl is almost the only copper salt for the Michael addition reaction offunctionalized organozinc halides, and the amount of CuCN·2LiCl used isstoichiometric. Because of the toxity of CN〓, we try to carry out the reaction inother way instead of CuCN.

但在带官能团的有机卤化锌的Michael加成反应中，到目前为止基本上都是使用毒性较大的铜盐CuCN-2LiCl，为了寻找更好的方法，并使其成为催化反应，我们以带官能团的有机碘化锌的Michael加成反应为目标反应，对FG-R-ZnI在有机合成中的应用进行了考察，得到了较好的结果。

Animal model is an important tool for experimental research, however, date to now, there is no ideal animal model for osteonecrosis of femoral head.

动物模型是实验研究的重要工具，然而，到目前为止，还没有理想的股骨头坏死的动物模型。

Up to now, there are many organic acids in order to synthesis nanotube、nanonod、flake of PANI, but no three acids on our paper.

到目前为止，选用的有机酸很多，但还没有本文选用的三种酸合成纳米管的报道。

Chest X-ray showed soft tissue opacity over the right paratracheal region with absence of a left aortic notch.

此病人到目前为止都是没有临床症状，体检发现胸部X光右侧靠近气管区发现增加软组织密度及左侧缺乏主动脉弓。

BACKGROUND: An ideal model of osteonecrosis of the femoral head is beneficial to the study on the cause of disease, pathogenesy and treatment. So far there has not been a coherent method to prepare this model.

背景：理想的股骨头坏死模型是研究其病因、发病机制及治疗的基础，但到目前为止，仍无一种模型制作方法得到公认。

So far, the development of digital photogrammetry, both in theory and in practice, mainly around the use of air photogrammetric mapping topographic maps, and for digital close-range photogrammetry little studied.

到目前为止数字摄影测量的发展，无论在理论上还是在实际上，主要是围绕着利用航空摄影测量测绘地形图，而对于数字近景摄影测量的研究甚少。

Pinkberry so far has been entirely self-funded.

到目前为止，Pinkberry资金完全自给。

Yet there exist com plex computations in science and engineer-ing which people are unable to make.

到目前为止，在科学和工程方面还存在许多人们无能为力的复杂计算。

Yet tITe exist com plex computations in science and engineer-ing which human are not unable to do.

到目前为止，在科技和工程方面还存在许多大部分人无能为力的复杂计算。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。