If plastic and rubber are burnt, they'll give off poisonous gases.

要是塑料和橡胶被焚， 就会放出有毒的气体。

Ways must be found to prevent the poisonous gases from polluting the air.

一定要找到办法防止有毒气体污染空气。

After the collapse, scientists were worried that all the poisonous gas that had been trapped would spread to the nearby towns.

在那次塌陷后，科学家担心油气井中所含的有毒气体会扩散到周围的市镇。

The plant, one of Europe's largest fertilizer factories, has pressurized tanks and more than 12 miles of pipelines holding poisonous ammonia gas.

这家化肥厂是欧洲最大的化肥厂之一，拥有加压罐和长达12英里的有毒氨气管道。

What made Thursday's attack so horrible, even in this war-torn country, was that it reportedly involved a poisonous gas, according to multiple activist groups in the country.

即使在这个饱受战争蹂躏的国家， 周四的袭击之所以如此可怕， 据该国多个激进组织称，是因为据报道它涉及一种有毒气体。