n. the fleshy part of the human body that you sit on
n. 臀部
1. She fell and landed on her buttocks.
她摔倒了，摔在了臀部上。
2. He does exercises to strengthen his buttocks.
他做锻炼来增强他的臀部力量。
3. The chair is designed for comfort and support for the buttocks.
这把椅子设计得舒适，能支持臀部。