名词
中文翻译：空的屁股
同义词：
['empty ass', 'hollow bladder']
例句：
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1.She sat on the chair with a hollow butt.
她坐在椅子上，屁股是空的。
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2.The old man's butt was so hollow that he couldn't walk very far.
老人的屁股太空了，走不了多远。
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3.The baby boy had a hollow butt and could hardly sit up.
这个婴儿屁股很空，几乎不能坐起来。