未有

First, there are not an accurate density and specific rotation and relative e.e. value of 2-chloropropionic acid. No one has proved that 2-chloropropionic acid can be directly separated by using chiral stationary phase.

首先，由于现有文献和试剂手册中对2-氯丙酸的旋光和光学纯度的对映关系没有一个明确的标准，而且也未有任何研究证明2-氯丙酸可以在现有的一些常用手性固定相上进行直接拆分。

State Formulas: Levy Formula , Bond Formula English only

州订立的方程式：通过徵税法案的方程式，公债券通过方程式未有中文翻译本

I preferred to make the choice myself, though the result would have been the same. In fact I had no money to do these things. One problem arose, however, when the old King, George V, died, and my mother asked me to take her to the cinema to see his funeral on the screen, for in those days television was unknown.

其实我都没有钱去做这些事，但我比较喜欢自己做选择，尽管结果可能也是一样，可是当老皇帝佐治五世逝世时，由於那个时代还未有电视，所以母亲便叫我带她到戏院，在萤幕上观看丧礼过程，那时问题便出现了。

With Oxus's help, recruiters in China now have at their disposal the means to communicate more effectively than ever with employees and potential employees.

通过傲喜的帮助，您在中国的人力资源专员有了从所未有的有效方式跟现有，潜在的员工进行交流。

Researchers in the United States have developed one for a Newcasois Newcastle disease in chickens, but so far there are no products for humans.

美国科学家已经在鸡身上研究出了一种来抵抗 Newcastle 病。至今还未有应用于人类的产品。

This was a great victory of the revolution which had never been recorded in Chinese history, a great victory of global significance for socialism and national liberation.

这是中国从古未有的人民革命的大胜利，也是社会主义和民族解放的具有世界意义的大胜利。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。