The synthesis isotactic polymers is usually only possible by means of special stereospecific (stereoregulating)initiators . 通常只能用特殊的立体定向（立体调节）引发剂来合成等规聚合物。
The infrared dichroism of a particular vibration of known origin has been used to give valuable information about molecular orientation . 已知基因特有振动频带的红外二色性，可以提供分子定向的有价值资料。
The synthesis of isotactic polymers is usually only possible by means of special sterospecific (stereoregulating)initiators . 通常只能用特殊的立体定向（立体调发）引发剂（Ziegler催化剂）来合成等规聚合物。
If sedimentary rocks are any guide, such a low fluid content would have a negligible effect upon the structural integrity of the material . 如果沉积岩是有任何定向的话，这种低的流体含量对物质结构的完整性几乎不起作用。
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On the new progress of the goal orientation theory 有关目标定向理论研究的新进展
Stability analysis of drill - string in directional drilling 定向井钻柱稳定性分析
Experiment on gps based high - accuracy attitude determination 精密定向研究的实验
Redirects one assembly version to another 将一个程序集版本重定向到另一个版本。
Redirect is need when a container is damaged 当容器遭受破坏时，需要用到重定向。
