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一个地方一旦有地面裂纹,平整的路面就会马上变得坑坑洼洼,而且一发不可收拾。因为水会进到裂缝里去,严冬的气候会使水结成冰,并开始膨胀,胀裂地基。冰溶化之后就留下了空洞,过往的车都蹭掉一块柏油,时间一长就变成了大大小小的坑。