人的嘴唇和手在冬天常常皲裂。
在冬天，一辆汽车产生的热量足以温暖一间普通的房子，如果一间房子完全隔热，一个成年人也可以产生足够多的热量来温暖它。
An automobile produces enough heat to warm an average house in winter, and if a house were perfectly insulated, one adult could also produce more than enough heat to warm it.
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