Teacher: We all know that heat causes an object to expand and cold causes it to contract. Now, can anyone give me a good example?
John: Well, in the summer the days are long, and in the winter the days are short.
老师：我们都知道物体受热会膨胀，遇冷会收缩。现在，谁能给我举个好例子？
约翰：嗯，夏天的时候白天长，冬天的时候白天短。
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