folding boom

例句：

1. 1.The construction site needed a folding boomto move heavy equipment around quickly.
   施工现场需要一台折叠式起重机来快速移动重型设备。
2. 2. The engineer used a folding boomto lift the heavy load off the ground.
   工程师使用折叠式起重机将重物从地面抬起。
3. 3. The folding boom wasdesigned to be compact and easy to transport, making it ideal for use in tightspaces.
   折叠式起重机设计紧凑，易于运输，非常适合在狭小空间中使用。