一类物质，大部分是合成的有机卤化物，能刺激眼睛黏膜引起疼痛和流泪。

Any of a group of substances, most often synthetic organic halogen compounds, that irritate the mucous membranes of the eyes, causing a stinging sensation and tears.

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碳的氧化物、硫的氧化物、氮的氧化物和卤化物等是由人类的生产活动和社会活动产生的重要的环境污染物质。

Oxides of carbon, sulfur, nitrogen and halogens are serious environmental pollutants produced by the productive and social activities of humans.

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