Heavy crankshaft is the key component of gas engine.

大型曲轴是大型内燃机的关键部件。

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Gas lift throwing-in and pulling matching device is an important component of gas lift production technique.

气举投捞配套装置是投捞式气举采油工艺的重要组成部分，在投捞式气举采油工艺中发挥着重要作用。

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This paper deals with the design of gas checking safety system for coal mine, which can be put into use for the purpose of monitoring the component of gas so as to keep the coal mine safe.

针对煤矿开采中存在有易爆炸气体瓦斯的问题，提出并设计安装了矿井瓦斯安全检测系统。

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But today Professor Andy Cooper and his team of chemists at the University of Liverpool in England are figuring out how it can help energy companies like BP or Shell store and transport methane gas, the principle component of natural gas.

FORBES: What Is Dry Water?

Methane is the principal component of natural gas, and massive amounts of it are trapped in reservoirs beneath the sea floor and under a layer of the ice-like substance.

FORBES

Methane is the main component of natural gas.

NPR: EPA Methane Report Further Divides Fracking Camps