B生物医药大词典by MedSci
例句 /

Press the power switch at the top of the flashlight to light on the LED indicator. Press again to switch off .

Press the power switch at the top of the flashlight to light on the LED indicator. Press again to switch off .

按下电筒头部电源开关,LED灯源点亮,再按一下即可关闭.