用你的牙齿破开瓜子壳，吃掉瓜子，然后吐掉瓜子皮。注意不吐皮的情况下不要吃瓜子。

Crack the shell with your teeth, eat the seed and spit the shell. Be cautious don't eat the seed without spitting the shell!

youdao

如果我让你拧掉这个家具的螺丝，你用手指去拧，那指甲就都毁了，要是用你的牙齿，它们也保不住。

If I ask you to unscrew the screw of the furniture, if you try it with your hands, all your nails will go. I'd allow you to use your teeth, they will also go.

youdao