This same effect protects you when you pinch out candles with wet fingers.
当你用湿手指掐灭蜡烛时，同样的效果也会保护你。
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The effect found in the iPad Album application that let you gather many pictures use the same behavior as the pinch gesture (zoom) but without rescaling images.
On the grounds of the pinch-off voltage, the cut-off point of variable resistance area and saturation area can be fixed, so the field effect tube can reliably work in the saturation area.