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一个男孩放学回家时，觉得肚子痛。"来，坐下，吃点点心，"妈妈说，"你肚子痛是因为肚子是空的。吃点东西就会好的。" Shortly afterwards Dad come in from the office, complaining of a headache. 一会儿，男孩的爸爸下班回家了，说是头痛。 "That's because it's empty," said his bright son. "You'd be all right if you had something in it." " 你头痛是因为你的脑袋是空的，"他那聪明的儿子说，"里面装点东西，就会好的。"
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