The pressure of the helium inside a blimp is about the same as that of the air outside, so the gas does not rush out.
气球飞艇内部氦气的压力和外部气压相近，因而气体不会溢出。
They suggest that the rush to develop the nation's vast, unconventional sources of natural gas is logistically impractical and likely to do more to heat up the planet than mining and burning coal.
文章指出，急于开发美国大量的非传统天然气资源在后勤保障上不太现实而且可能会比开采燃烧煤炭更会使地球变暖。
Indeed, the rush for shale assets in Europe has been led by many of the big firms that at first overlooked unconventional gas in America ...
的确，如今在欧洲出现的争夺页岩气资源的场景已经被许多大型公司导演，他们先前忽略了美洲的非传统天然气资源。
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