Foodstuffs may be dried in air, superheated steam, in vacuum, in inert gas, and by the direct application of heat.

食物可以在空气、过热蒸汽、真空、惰性气体中干燥，可以用直接加热干燥。

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Helium is far lighter than air and is inert, which means it won't combust when you combine it with air and energy, like Hydrogen does (below).

氦气比空气轻得多并且是惰性气体，这意味着，当它与空气和明火接触不会燃烧，而氢气却会(请看下图)。

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In the presence of this inert gas, the air.

在有惰性气体，空气存在情况下。

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