loading and unloading arm

例句：

1. 1. The loading and unloading armis used to lift heavy objects from theground.
   装卸臂用于从地面举起重物。
2. 2. The loading and unloading arm wasdesigned to make the process more efficient.
   装卸臂的设计是为了使过程更加高效。
3. 3. Theloading and unloading arm is essential forany warehouse operation.
   装卸臂对于任何仓库操作都是必要的。