读寓言故事学英语：热胀冷缩

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Teacher：We all know that beat causes an object to expand an cold cauese 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：我们都知道热胀冷缩的道理。现在，谁给我举个例子？

约翰：嗯，在夏天天都长，在冬天天都短。