Use a laser pen to irradiate one fly's compound eye.
用激光笔照射一只苍蝇的复眼。
Laser pen button: press this button to activate the laser pen.
激光笔按键：按下此键点亮激光笔。
The touching control pen includes a pen body, a laser-pointing device and a switch.
此种触控笔包含一笔身、一激光指向器及一开关。
The touching control pen includes a pen body, a laser-pointing device and a switch.
此种触控笔包含一笔身、一激光指向器及一开关。
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