
n.動臂起重機;油井架吊桿;進線架;飛機的起飛塔
The ginpole is the simplest form of derrick. 起重吊桿是一種最簡單的起重機。
They were placed by a derrick mounted on rails on the bridge deck. 它們由軌道上的轉(zhuǎn)臂吊機吊放在橋面上。
We put up at the surface an oil derrick. 我們就在那塊地面上豎起一個井架。
The derrick has been skidded to the towing position. 井架已經(jīng)移到適合托航位置。
井架