1. They were digging a ditch.
    他们在挖沟。

2. They toiled all day digging the trench.
    他们整天艰苦地挖壕沟。

3. A spade is used for digging into the ground.
    铁锹用来掘土。

4. At one place we found some young people digging pits.
    一些小伙子在一处挖坑，