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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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