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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The wait getting back into the U.S. at the border in Tijuana frequently takes longer than two hours and cars can burn about a gallon of gas for each hour they idle.

从提华纳过境凡返回美国通常需要等两个多小时，而每辆车每等一小时大概就要耗用1加仑的油。

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

BBC: Kuwait MPs pass law to naturalise 4,000 stateless Bidun

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.

FORBES: Pork Prices and Inflation