The workers were driving a tunnel.
工人们在挖一条隧道。
Small size tunnel driving is a construction technology of underground piping without excavation.
小型隧道掘进是一种无需开挖的地下管道施工技术。
It must be because we're driving through a tunnel. Try an FM station.
一定是因为我们在隧道里。试看看调频。
Tunnel artificial lighting is an important guarantee for the safety of the tunnel driving.
隧道人工照明是隧道通行安全的重要保障。
Tunnel artificial lighting is an important guarantee for the safety of the tunnel driving.
隧道人工照明是隧道通行安全的重要保障。
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