文章阐述了直升机钻机的设计理念，分析了直升机吊装技术钻机的结构特点。
The article expatiates upon design theory of heli-drilling rig and analyses their structural features.
在视野内还可以看到另外20多个临时的平台，外加几个钻机，还不包括所有用来载运员工和供给的所有船只和直升机生日员工。
Another 20-odd platforms are visible, plus several drilling RIGS, not to mention all the ships and helicopters carting staff and supplies around.
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