The gas would have the dual effect of choking air-breathing animals and preventing sunlight from reaching Earth's surface.

这些有毒气体不仅会使动物造成了窒息，而且对照射到地球表面的阳光产生了严重阻挡。

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Palestinian residents described how on June 27th police charged through Silwan's narrow thoroughfares firing tear-gas grenades through Windows and doors, choking people inside their homes.

巴勒斯坦人讲述着6月27日警察是怎样冲过西尔万狭窄的道路而后对着窗户门发射催泪弹，让屋里的居民窒息而死。

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Hold the bottle; don't prop it up by itself. This can help prevent choking, extra gas, tooth decay, and provide bonding time.

握紧奶瓶，不要让它自己滴下来，这样能防止窒息，过多的气体，牙齿的腐蚀，而提供了亲子联系的时间。

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Choking from the tear gas fired into the crowd, some hoisted sledgehammers to smash up the pavement in order to hurl broken slabs over improvised barricades that now enclose a makeshift camp.

ECONOMIST: The police fires live rounds at protesters

They threw tear gas and pepper gas and everybody was choking and suffocating.

BBC: Friday prayers: Differing views