用多晶样品来测量有方向性的特征。

One determines a directionally dependent property in a polycrystalline specimen.

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那种天线可接受没有方向性的信号。

The antenna received signals with no directivity.

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无罐流程是近代油气收集与处理流程中带有方向性的流程。

Nowadays, it is popular to use the no-tank process in oil and gas gathering, transferring and treating.

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And it follows qualitatively from just your ordinary observations a bout the direction in which things go spontaneously, right.

定性地来说,就是你们日常生活中观察到,自发进行的物理现象,会有方向性。

麻省理工公开课 - 热力学与动力学课程节选

Synthesis always occurs in one direction and that makes sense to you now because you know there's a directionality and the chemistry is different going one way than the other and this DNA polymerase only works on the chemistry going in one direction.

NA复制过程是单向的,现在你们该明白原因了,因为DNA单链有方向性,DNA在两个方向上化学性质不同,DNA聚合酶,只在一个方向上起作用

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