士兵们(那时)正在挖战壕。

The soldiers were digging trenches.

youdao

儿时，这里是我们最好的乐园，我们在沙滩上捡贝壳，寻鹅卵石，做沙人，挖“战壕”，打沙仗，光着脚丫奔跑，把风筝放得高高的。

Childhood, here is our best paradise, we are picking up shells on the beach, look for pebbles, making sand people dig "trenches", playing sand battle, barefoot running, to put the kite high.

youdao