To make a tunnel through or under.

在…掘隧道穿过或在…下面开通一条坑道。

youdao

They are digging through the hill to make a tunnel.

他们正在凿山建一条隧道。

youdao

They are digging through the hill to make a tunnel.

他们正在凿山建一条隧道。

youdao