A handheld pointerdevice 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。
2
Another alternative to the mouse as a pointing device is to use a gaze-tracking camera, which works out where you are looking and moves an on-screen pointer accordingly.
另外一种鼠标替换物是视线跟踪系统，它能判断出你的视线移动的位置并相应地调整屏幕光标移动的位置。
3
We can use an indicator with a pointer or a continuous recording device.