trough for catching falling rocks

例句：

1. 1. The farmer used a trough to collect the rainwater.
   农民用一个沟渠来收集雨水。
2. 2.The car was parked in a deep trough.
   汽车停在了一个很深的沟里。
3. 3.The old man walked down the trough to get some water.
   老人沿着沟走去找水喝。