Although there is 34,500 tons of gaseous nitrogen in the air column above each acre of the earth's surface, this cannot be used by plants until it has been fixed by nitrogen-fixing bacteria and algae.
虽然在地球表面每英亩空气柱中有34,500吨气态氮，但是如果这些气态氮不被固氮菌和藻类固定，是不能被植物利用的。
During the steady arc discharge course, liquid is heated up by the hot arc plasma, so a gas bubble is formed around the arc column and affords a gaseous environment for arc discharge.
在电弧稳定燃烧的过程中，液体被电弧的高温所加热，在弧柱周围形成气泡，为电弧提供了一个气体氛围的放电环境。
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