Factories that gave out harmful gases were all shut down after the policy came into effect.
在政策生效之后，所有排放有害气体的工厂都关闭了。
2
Its peak, that is, there is the most carbon dioxide and methane gas, greenhouse gases in the atmosphere just after the beginning of the interglacial period.
它的峰值，就是在间冰期刚开始，大气中有最多的二氧化碳和甲烷气体，温室气体。
3
After cremation, water is used to cool gases in the crematorium chimney.