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1·The oil is considered technically recoverable using existing technology, but the USGS did not consider the cost of overcoming obstacles to drilling, such as permanent sea ice or deep waters.

从技术层面上来讲，利用现有的技术是可以开发（北极的）石油的，但是美国地质调查局并没有考虑为克服开采困难而产生的成本，如永久海冰以及海洋深水。

2·The main features lie in lowering production cost by using simple equipment and control system and cheap and recoverable stuffing material and …

其主要特点是设备及控制系统简单，填料价廉且可反复回用，成本低，产品质量有确切保证。

3·The main features lie in lowering production cost by using simple equipment and control system and cheap and recoverable stuffing m…

其主要特点是设备及控制系统简单，填料价廉且可反复回用，成本低，产品质量有确切保证。