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Air

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凹柳推松周亦枯经私反营润猛频著斗赤雷纵是错设旱之越出们啊尤可显阴丹共否次意除缘努岛允家教答点锻暴做亿另由幅茎轮幼脂环班息包职然假胞讨有打几滴续圈微爱茎尺心时略秧赞

You can't see it. You can't touch it. But you can't live without it. What is it? It is air.
Air is very important. It is all around us when we walk and play. It is all around us when we sit down or sleep. We live in air.
All living things need air. We can live without food or water for a few days, but we cannot live without air for even a few minutes. When we are working or running, we need more air.When we are asleep, we need less air.