The earth was heavier than the air, so it was put below.
大地比空气重, 所以被放在下面。
It is a colourless, odourless and tasteless gas, slightly heavier than air.
它是一种无色、无溴、无味的气体，比空气稍重。
ramble in the air, harmony and safety flying safety, heavier than mount tai.
漫步云端，谐和平安飞行安全，重于泰山
When liquid oxygen evaporates the gas produced is very cold and so is much heavier than air.
当液氧蒸发时，产生的气体温度很低，并比空气轻。
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