If you smell gas, shut off the main gas valve.

如果你闻到煤气味，关闭总阀门。

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In April 2009, a major explosion damaged the main gas pipeline connecting Russia to Turkmenistan.

2009年4月，一场大爆炸对连接俄罗斯与土库曼斯坦的主要天然气管道造成了严重损坏。

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A main gas panel shall be installed at the entry point of the gas lines equipped with regulator and gauge.

气体管路的前段安装气体调节装置和压力表。

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His main targets were companies that supplied the public with water, electricity,and natural gas.

VOA: special.2010.08.05

They allege that the company's drilling polluted their water with chemicals,metals and methane, the main constituent of natural gas, causing explosions as well as gastrointestinal and neurological illness.

VOA: standard.2010.01.02

The main goals of the summit are to agree on targets to cut to greenhouse-gas emissions and to set up a mechanism to provide developing countries with the billions of dollars needed to cope with climate change.

VOA: standard.2009.12.17

They say aircraft emit more of the main greenhouse gas than cars for each passenger they carry.

BBC: Pollution warning on holiday flights

Scientists presume that carbon sinks can slow the effects of global warming by trapping the main greenhouse gas, carbon dioxide.

CNN: Shrub census shows Alaskan Arctic losing its cool

Keenest of all, Denmark, Finland, the Netherlands, Norway and Sweden now tax emissions of carbon dioxide, the main greenhouse gas.

ECONOMIST: Taxes for a cleaner planet