direct air brake pipe

例句：

1. 1.The direct air brake pipe is essential for the safe operation of the train.
   直接空气制动管对于火车的安全运行至关重要。
2. 2.The engineer carefully inspected the direct air brake pipe before starting the engine.
   工程师在启动引擎前仔细检查了直接空气制动管。
3. 3.The direct air brake pipe was damaged during the accident, which caused a delay in the rescue operations.
   事故中直接空气制动管受损，导致救援行动延迟。