堑

例句：

1. 1. The soldiers dug a trench to protect themselves from the enemy's attack.
   士兵们挖了一条壕沟来保护自己免受敌人的攻击。
2. 2. The river flows through a moat, providing a natural defense for the city.
   这条河穿过一条护城河，为这座城市提供了天然的防御。
3. 3. The farmer used a ditch to divert water from the stream.
   农民使用一条沟渠将水从溪流中引走。