名词
中文翻译：臀部
同义词：
['buttocks', 'buttock', 'glutes']
例句：
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1. She sat down on the couch with her buttocks sticking out.
她坐在沙发上，臀部凸出。
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2. The gymnast's buttocks were tight and firm.
体操运动员的臀部紧绷有力。
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3. After a long day at work, she stretched her buttocks and yawned.
工作了一天后，她伸展了一下臀部，打了个哈欠。