unloader arm

例句：

1. 1. The unloader arm is used to lift heavy objects off the truck.
   卸载臂用于将重物从卡车上卸下。
2. 2.The unloader arm was designed to make loading and unloading easier.
   卸载臂的设计是为了使装卸工作更加便捷。
3. 3.The unloader arm was a critical component of the new warehouse system.
   卸载臂是新仓库系统的一个关键组成部分。