声音简介
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.
长和短
老是:我们都知道热胀冷缩的道理。现在,谁给我举个例子?
约翰:嗯,在夏季白天都长,在冬季白天都短。
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