Heavy crankshaft is the key component of gas engine.
大型曲轴是大型内燃机的关键部件。
Methane is a principal component of natural gas.
天然气的主要成分是甲烷。
Gas expenditures have become a very important component of daily consumption.
汽车油耗支出已经成为日常消费很重要的一项组成。
Gas expenditures have become a very important component of daily consumption.
汽车油耗支出已经成为日常消费很重要的一项组成。
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