名词
中文翻译：Unknown
同义词：
['buttocks', 'buttock', 'ass', 'rear end', 'posterior']
例句：
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1. She sat down on the couch with her bummalo facing the TV.
她坐在沙发上，屁股对着电视。
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2. The buttock muscle is responsible for supporting our weight.
臀部肌肉负责支撑我们的重量。
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3. The buttocks are often used as a reference point in drawing or sketching.
臀部常作为绘画或素描的参考点。