空气是成立的三种主要类型的气体：氧，二氧化碳和氮。
Air is made up of three main types of gases: oxygen, carbon dioxide, and nitrogen.
氧、二氧化碳、氮是动植物生命所必需的。
Oxygen, carbon dioxide, and nitrogen are essential for animal and plant life.
氧、二氧化碳、氮是动植物生命所必需的。
Oxygen, carbon dioxide, and nitrogen are essential for animal and plant life.
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