directional property

• 方向性

directional property的用法和样例：

例句

1. One determines a directionally dependent property in a polycrystalline specimen.
   用多晶样品来测量有方向性的特征。
2. Counters can, of course, be made highly directional by the use of external collimation.
   当然可以利用外部准直法来提高计数器的方向性。