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汉语拼音：wǎ sī

一般指煤气、天然气等气体混合物。有时专指矿井中危害人的生命安全并能引起爆炸的有害气体。在煤矿中有时又专指沼气（甲烷）。

1. 荷兰语gas的译音。汉语来自日语。泛指气体。亦指煤气。军事上称有毒气体为毒瓦斯。

   鲁迅 《花边文学·玩笑只当它玩笑（上）》附录《康伯度答文公直》：“一个‘瓦斯’，是 德国 字的原封不动的 日本 人的音译。”

• Riot police hurled tear gas canisters and smoke bombs into the crowd.

  防暴警察向人群中投掷了催泪瓦斯罐和烟幕弹。

• The army responded with gunfire and tear gas.

  军队用炮火和催泪瓦斯予以反击。

• Keith Vass, editor, denies he had inside knowledge.

  编辑基思·瓦斯否认他知道内部消息。

• Vaska strummed away on his guitar.

  瓦斯卡弹拨着自己的吉他。

• Turn off the gas; the milk is boiling over.

  关掉瓦斯, 牛奶溢出来了.

• The gas is out.

  瓦斯熄灭了.

• The day of terror ended after police used teargas and stormed the house.

  警察使用了催泪瓦斯攻入屋子以后，恐惧的一天结束了。

• The only way to curb this unruly mob is to use tear gas.

  压制这群暴徒的惟一方法是使用催泪瓦斯.

• The chemical agent, whether it be mustard gas or nerve gas, can be absorbed by the skin.

  这类化学制剂，不管是芥子气还是神经瓦斯，都会被皮肤吸收。

• I was scared ( that ) we'd run out of gas.

  我怕瓦斯告罄而提心吊胆.

• He said he had a date with Brett at San Sebastian.

  他说他曾和勃莱特约定在圣塞瓦斯蒂安相会.

• Even on a hot day San Sebastian has a certain early - morning quality.

  即使在大热天,圣塞瓦斯蒂安也有某种清晨的特点.

• Conversion of your heating system from coal to gas will be costly.

  你把暖气系统由烧煤改造成烧瓦斯会花好多钱.

• The police used tear gas to subdue the rioters.

  警察使用了催泪瓦斯来镇压骚乱分子.

• Some stoves are oil burners; others are gas burners.

  有些炉子是烧油的, 有些是烧瓦斯的.