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1. 在这张照片中，可以看到鼠标底部的传感器。

   zài zhè zhāng zhào​piàn zhōng, kě yǐ kàn dào shǔ​biāo dǐ​bù de chuán​gǎn​qì.

   In this photo, you can see the sensor on the bottom of the mouse.

   Source: CCMatrix