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.
妈妈轻轻地拍了拍宝宝的屁股。
The mother gently patted the baby's ___bottom.
他坐在一把硬椅子上，臀部疼。
He sat down on a hard chair and his ___bottom hurt.
