tunnel cap

例句：

1. 1. The engineers werewearing tunnel caps to protect their headsfrom the cold air.
   工程师们戴着隧道帽，以防头部受到冷空气的侵袭。
2. 2.The workers had to wear tunnel capswhile working in the mine.
   工人们在矿井工作时必须戴上隧道帽。
3. 3. Thetunnel cap was designed tokeep dust and debris out ofthe tunnel.
   隧道帽的设计是为了将灰尘和碎片挡在隧道外。