thumb

He accidentally hit his left thumb with a heavy hammer while trying to drive a nail into the wood.

(Chinese) 当他试图把钉子钉进木头里时，不小心用重锤砸到了左手大拇指。

In many Western cultures, a raised thumb is a common gesture used for hitchhiking.

(Chinese) 在许多西方文化中，竖起大拇指是搭便车的常用手势。