n.动臂起重机；油井架吊杆；进线架；飞机的起飞塔
The ginpole is the simplest form of derrick. 起重吊杆是一种最简单的起重机。
They were placed by a derrick mounted on rails on the bridge deck. 它们由轨道上的转臂吊机吊放在桥面上。
We put up at the surface an oil derrick. 我们就在那块地面上竖起一个井架。
The derrick has been skidded to the towing position. 井架已经移到适合托航位置。
井架
