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.
一个好例子
老师：我们都知道热胀冷缩的道理。现在，谁能给我举个例子呢？
约翰：嗯，在夏天天都长，在冬天天都短。 |
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