They're in their world of toxic gases and spiders.

毒气有毒气的世界，蜘蛛有蜘蛛的世界。

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The apparatus can sense the presence of toxic gases.

这个仪器能够检测出有毒气体的存在。

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Green. Speaking of cars, apart from the CO2 from your breathing, bikes don't release toxic gases.

说到汽车，除了呼吸排放的二氧化碳，自行车不排放有毒气体。

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"It could be hitting natural fractures that already exist." Fox notes that toxic gases like benzene,toluene and hexane also accompany natural gas extraction.

VOA: standard.2010.01.02

It said they contain large amounts of plastic and flammable insulation, which can cause large fires that spread quickly and highly toxic gases.

BBC: Fire warning over 'dangerous modern fridge freezers'

When they then fired chemical weapons, the toxic gases seeped in and often pooled in the cellars, proving even more deadly, she said.

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These so-called fairy circles have variously been pinned on the presence of other, poisonous plants, on ants, and even toxic gases rising from below.

BBC: Termites 'engineer fairy circles'