工人们正在城市下方挖掘隧道以改善交通。

Workers are ___tunnelling beneath the city to improve traffic flow.

公司使用加密技术通过tunnelling安全传输敏感数据。

The company uses encryption to securely transmit sensitive data through ___tunnelling.

研究人员惊讶地发现粒子能够穿过看似不可能通过的势垒。

Researchers were amazed to see particles ___tunnelling through what appeared to be an impenetrable barrier.