The surface must be free from oil, grease and dirt, and be dry prior to application.
施工表面必须除净油污和杂质，并在施工前务必保持干燥。
The surfaces to be joined must be clean and free from oil, grease and heavy oxides.
连接部位表面必须清洁，没有油污、油脂和氧化物。
The amount of gas released from oil increases from east to west, it can be 12.82% of gas in free phase expelled from source rock, it is important part of gas accumulation in Western Slope.
油溶释放气量可占到源岩游离相天然气排出量的12.82%，应是西部斜坡区天然气成藏的重要组成部分。
The separated (B4) oil can thus be collected from the relatively ice-free water surface (WL1) with an oil collecting device (200), which may have for example a brush skimmer.
因此能从相对无冰的水面(WL1)上利用油收集装置(200)来收集分离出的油(b4)，该油收集装置可例如具有刷式撇油器。
Lisa: We'd be free from our dependency on foreign oil in 17 years.
丽莎：我们会免于依赖外国石油17年。
Lisa: We'd be free from our dependency on foreign oil in 17 years.
丽莎：我们会免于依赖外国石油17年。
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