The power and oil and gas sectors were the most frequently targeted.

电力、石油和天然气部门是最常被攻击的目标。

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Moreover, because gas is frequently encountered in association with oil, the production, refinement, transportation, and storage of crude oil is also a source of methane emissions.

此外，由于天然气常与石油混在一起，原油生产、提炼、运输和储存也是一个甲烷排放来源。

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Some creatures are part of food chains that begin with methane gas which seeps from the Earth's interior in particular places, frequently at the bottom of the sea.

有些生物存在于以甲烷为第一营养级的食物链中。甲烷是从地球内部可燃气体，通常在海底渗出。

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Security forces have frequently responded by firing tear gas to disperse the protesters or arresting them.

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That question may never be asked in a highly developed economy like the United States where increases in prices at the gas pump are felt most directly by consumers, but it is a question that is being asked frequently these days in China where food is such an important part of the budget for most.

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