collapsed

例句：

1. 1. The house was completely collapsedafter the earthquake.
   地震后，这所房子完全倒塌了。
2. 2. The old tree had fallenover and was now a pile ofrubble.
   那棵老树已经倒下了，现在变成了一堆废墟。
3. 3. The economyis collapsing due to the lackof investment.
   由于缺乏投资，经济正在崩溃。