roof fall

• 顶板陷落

roof fall的用法和样例：

例句

1. Its fall did much to interrupt the trade with the East.
   它的陷落大大妨碍了同东方的贸易。
2. The fall of Minsk signaled the end of resistance throughout Belarus.
   明斯克的陷落标志着白俄罗斯抵抗的结束。
3. The roof of the cave dropped in on the miners, trapping them.
   窟洞冒顶，把矿工封在里面了。