A handheld pointer device provides radiation with a directional characteristic relative to its main axis.

一种手持式指向设备，提供相对于其主轴具有方向特征的辐射。

youdao

A handheld pointer device provides radiation with a directional characteristic relative to its main axis.

一种手持式指向设备，提供相对于其主轴具有方向特征的辐射。

youdao