rack tube

例句：

1. 1. The engineer used a rack tube to support the heavy load.
   工程师使用一个架子管来支撑沉重的负载。
2. 2.They installed the rack tubes in the ceiling for easy access.
   他们安装架子管在天花板上以便容易访问。
3. 3. The rack tubes were designed to hold the equipment securely in place.
   架子管被设计用来将设备安全地固定到位。