buttocks
US /ˈbʌt.əks/
UK /ˈbʌt.əks/

复数名词
1.
臀部, 屁股
the two rounded fleshy parts of the human body that form the rear part of the trunk
示例:
•
She landed hard on her buttocks.
她重重地摔在了臀部。
•
The doctor examined the patient's buttocks.
医生检查了病人的臀部。
在 Lingoland 学习这个单词