下巴

例句：

1. 1. She tilted her head to the side and looked at her own chin in the mirror.
   她侧着头，在镜子里看着自己的下巴。
2. 2. The man's chin was covered in a thick beard.
   这个男人的下巴上长着浓密的胡须。
3. 3. He lifted his chin proudly and walked away.
   他挺起胸膛骄傲地走开了。