portal jib crane

例句：

1. 1.The portal jib crane was used to lift heavy objects from the ground.
   门式起重机被用来从地面举起重物。
2. 2.The portal jib crane was used to transport goods across the river.
   门式起重机被用来在河流上运输货物。
3. 3.The portal jib crane was used to support the construction of a new bridge.
   门式起重机被用来支持新桥梁的建设。