shelter trench

例句：

1. 1. The soldiers dug a shelter tunnel to protect themselves from the enemy's attack.
   士兵们挖了一个掩体隧道来保护自己免受敌人的攻击。
2. 2. The engineers designed a shelter tube to support the heavy equipment during construction.
   工程师们设计了一个掩蔽隧道来支持施工中的重型设备。
3. 3.The cave was used as a shelter pit by the animals during the harsh winter.
   这个洞穴被动物用作冬季的避难所。