名词
中文翻译：屁股
同义词：
['butt', 'buttocks', 'rump', 'rear end']
例句：
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1. He sat on the couch with his bum sticking up in the air.
他坐在沙发上，屁股翘起来。
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2. She was wearing a pair of shorts that were too big for her bum.
她的短裙太大，穿在屁股上不合适。
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3. The man had to sit on the floor because he couldn't fit into his own bum.
那男人不得不坐在地板上，因为他的屁股太大了。