查找百分号(%)膨胀和收缩！
正如我们所知道的，物质随着温度的增加和减少而膨胀和收缩。
As we know, materials expand and contract with the increase and decrease of temperature.
这也就是说，岩石的“哭声”正是由这种膨胀和收缩的过程产生的。
That is to say the "crying sound" is an exact result of this expansion-contraction process.
钢和混凝土有几乎相同的收缩率和膨胀率。
Steel and concrete have almost the same rate of contraction and expansion.
钢和混凝土有几乎相同的收缩率和膨胀率。
Steel and concrete have almost the same rate of contraction and expansion.
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