Permanent towers, called derricks, used to be built to handle the long sections of drilling pipe.
被称为井架的永久性的塔，过去是为处理长距离钻探管道而建的。
Lofty derricks dot the landscape in an oil field.
高耸的井架点缀着油田的景色。
Operating engineers: Playing with giant toys like bulldozers, front-end loaders, backhoes, scrapers, motor graders, shovels, derricks, large pumps, and air compressors can be fun.
施工工程师：摆弄那些大型玩具可能是很有趣的，比如推土机、前载车、反向铲、刮运机、平地机、铲车、起重机、大型水泵以及空气压缩机。
Capacity of derricks 20tonnes.
船吊吊载能力20吨。
Keep safe working load of derricks.
让吊杆在安全负荷下工作。
Lower down and secure all derricks and report.
放下，绑牢吊杆并报告。
Please swing the derricks outboard. We want to use the shore crane.
请把吊杆甩到外档去，我们要用岸吊作业。
Derrick guy wire as the special supporting member of downhole derricks, its performance has much impact on the mechanical behavior of derricks.
绷绳作为作业井架的特殊支承构件，其工作特性对作业井架的力学行为有较大影响。
They suffer from being heavier than conventional derricks and consequently are not usually found in offshore environments, where weight is more of a concern than in land operations.
桅架的重量较常规井架要大，因此海洋钻井中不常使用，因为海洋钻井时比陆地作业时更关注重量。
Derricks are scattered here and there on the boundless plain.
在一望无际的原野上散布着一座座井架。
AI, Annual Inspection for Derricks and Permanent Attachments to the Derricks, Masts and Decks;
吊货杆及连接于吊货杆、桅和甲板的固定零部件的年度全面检验；
AI, Annual Inspection for Derricks and Permanent Attachments to the Derricks, Masts and Decks;
吊货杆及连接于吊货杆、桅和甲板的固定零部件的年度全面检验；
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