有毒热重气体沉降到地面会对人和动植物造成危害。
The noxious hot - weighty gas subsiding to ground will be harm to human and plants.
当碳与氧结合形成一种无色、无味、无嗅的气体叫做二氧化碳，它比空气重，可以灭火。
When carbon unites with oxygen, it forms a colorless, odorless, and tasteless gas called carbon dioxide, which is heavier than air and will extinguish a flame.
一个由寒冷气体混合比氦要轻但是不会比氢重很多的大气层，意味着热气球将需要使用。
An atmosphere composed of a cold gas mix that is lighter than helium and not much heavier than hydrogen, means that hot-air ballooning will need to be used.
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