chip trough

例句：

1. 1. The farmer used a chisel to chip out the trough in the field.
   农民用凿子在田野里挖出沟渠。
2. 2. The car was stuck in the trough of the river.
   汽车卡在河里的沟渠里了。
3. 3. The construction crew had to chip the trough and fill it with concrete.
   建筑队不得不挖开沟渠并填上混凝土。