downtand

例句：

1. 1.The old building fell down in the storm.
   暴风雨中，那座老建筑倒塌了。
2. 2.The roof of the house collapsed after a strong wind.
   一阵强风过后，房子的屋顶坍塌了。
3. 3.The bridge was toppled by the heavy rain.
   大雨导致这座桥坍塌了。