常见例句双语例句This paper introduces how to dismantle yarding tractor loading board, install trestle pole and use tightwire and chain wheel to load and unload cargo.本文介绍如何拆下集材拖拉机搭载板，安装架杆，利用绞盘机、钢索及架杆滑轮装卸货物。 返回 trestle board