It has very prominent importance in the oil and gas industry, both test Wells and non-test gas, it is a decisive factor.

它在石油与天然气工业中的重要性是十分突出的，无论是试气井还是非试气井，它都是一个决定性的因素。

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Said aim is achieved by using a gas mixture of nitrogen and hydrogen as a test gas and inspecting the cooling circuit by means of a hydrogen probe once a drop in pressure has been recorded.

本发明的任务如下解决，将氮气和氢气 构成的气体混合物应用作为检验气体，并且在记录到制冷剂循环系统的压力下 降之后采用氢气探头进行查找。

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The scientist did a test and found that trees can grow because of water and a gas from the air.

科学家做了一个测试，发现树木可以生长，是因为水和空气中的气体。

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Coastal Oil and Gas was last year granted planning permission to dig a borehole to test for gas below farmland in Kent in what has been described as a similar scheme.

BBC: Public inquiry over gas drilling in Vale of Glamorgan

Plans by a UK energy company to test whether gas can be extracted from coal beds near Keynsham has prompted residents to hold a public meeting.

BBC: Meeting over Keynsham gas extraction plan by UK Methane

And earlier this month, Airbus, in association with Shell, Rolls Royce and Qatar Airways, began a research project to test 'Gas to Liquid' (GTL) technologies that convert lower-emission natural gas and other synthetic fuels into liquid kerosene.

CNN: Flight of biofuel fancy?