derrick wagon crane

例句：

1. 1. The derrick is usedto lift heavy objects from the ground.
   起重机用来从地面举起重物。
2. 2. The crane truck was used to transport the heavyequipment.
   起重机卡车用来运输重型设备。
3. 3. Thederrick was used to support the building's structure.
   起重机用来支撑建筑物的结构。