由于罐是密封的，气体逐渐积聚起来，使罐头膨胀。

Because the can is sealed, the gas builds up, causing the can to swell.

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在二冲程发动机中你必须混和燃料和气体，因为气缸壁上的孔阻止使用活塞环密封燃烧室。

You have to mix oil into the gas in a two-stroke engine because the holes in the cylinder wall prevent the use of rings to seal the combustion chamber.

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页岩储藏气体比其他岩石更密封，要从中抽取就必须用海量淡水在高压下炸开页岩并，这种方法叫做水压致裂法。

Shale traps gas more tightly than other rock. To extract it, the shale is blasted with huge volumes of fresh water at high pressure, a practice known as hydraulic fracturing, or "fracking".

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