semi-gantry crane

例句：

1. 1.The semi-gantry crane is used for lifting heavy loads.
   半门式起重机用于吊起重物。
2. 2.The construction site needed a large semi-gantry crane to move the equipment.
   施工现场需要一台大型的半门式起重机来移动设备。
3. 3. The engineer carefully operated the semi-gantry crane to ensure safety.
   工程师小心操作半门式起重机以确保安全。