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Methane, four atoms of hydrogen bound to a carbon atom, is the main component of natural gas on Earth.

甲烷由四个氢原子和一个碳原子组成，是构成地球大气的主要气体。

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Now, the LCROSS observations provide a handy explanation for the hydrogen: it's bound with oxygen to form water.

现在，LCROSS的观测提供了一个方便的解释：氢与氧结合，形成了水。

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The linear glucan molecules of cellulose are bound together by hydrogen bonds.

纤维素中直链葡聚糖分子由氢键连接在一起。