Uses: Helium is used in balloons and in deep-sea diving to dilute oxygen that divers breathe.
用途：氦被用于气球中，也用于深海潜水。在深海潜水中，氦用来稀释潜水员所呼吸的氧气。
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In this paper, it is introduced of underwater operating mission when installing petroleum drilling platform and medical guarantee for air diving and oxygen-heliumdiving.