roof fall

例句：

1. 1. The old house's roof fell apart during the storm.
   暴风雨期间，这所老房子的屋顶塌陷了。
2. 2.He had to repair the roof of his car after it fell down from age.
   他的车因为年久失修而屋顶坍塌了，他不得不修理它。
3. 3.The roof of the building collapsed due to heavy snowfall.
   由于大雪，这座建筑的屋顶坍塌了。