derrick

复数：derricks

oil derrick井架；油井架；钻油塔

1. The ginpole is the simplest form of derrick.
   起重吊杆是一种最简单的起重机。
2. 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。
3. We put up at the surface an oil derrick.
   我们就在那块地面上竖起一个井架。
4. The derrick has been skidded to the towing position.
   井架已经移到适合托航位置。

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