If the protective seal is not air proof or poor gas purity, it will also bring welding quality problems.

气路有密封不好的问题，或气体纯度不高，也会引起焊接质量问题。

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Excessively large sizes of particles give rise to reduced reactivity of fuel, causing start-up problem and poor gas quality.

粒子尺寸过大引起的燃料减少，反应性，导致启动问题的气体质量差。

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Tran Lam, an employee of an oil and gas company, said that his hometown is a poor village in the central region.

春林是一家油气公司的员工，他说他的家乡是中部一个贫困的村庄。

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Even with poor gas mileage on most RV units, these vagabonds can travel for about one-fifth what others pay who fly, buy meals in restaurants, and stay in motels.

VOA: standard.2010.03.01

The proposals would also enable the gas distribution companies to connect around 80, 000 "poor fuel households" to the gas network for the first time, and pay for carbon monoxide awareness programmes.

BBC: Energy bill rises not enough, says National Grid

Gas does now contribute 35% to power generation, but rock-bottom prices and a sniffiness about gas as oil's poor relation mean that exploiting its bounty (Saudi Arabia apparently has the world's fifth-largest gas reserves) has proven hard.

ECONOMIST: Gulf states not only pump oil; they burn it, too

The populists shout louder, and claim that they are helping the poor through state control of oil and gas.

ECONOMIST: A fight between democrats and populists