定向性
[词典] directionality; directing property; directive property; stereotaxis;
[例句]碟形卫星天线的定向性非常强。
Dish aerials are highly directional
指向性
[词典] directivity; directionality; [电磁] directive property;
[例句]介绍了指向性因数和指向性指数的定义、计算式。
The definition of directivity factor, directivity index& equation are introduced firstly.