Definition: the part of your body that you sit on Level: B1
她滑倒了，摔在了她的臀部上。
She slipped and fell on her ___bottom.
有两个人抓着我的手臂，梯子下第三个人抓着我的臀部。
There were two people holding my arms, and the third one on the ladder below me was holding my ___bottom.
他坐在一把硬椅子上，臀部疼。
He sat down on a hard chair and his ___bottom hurt.
