But a large proportion of global greenhouse gas emissions are actually other gases, such as N2O (nitrous oxide) and CH4 (methane).

但是，全球温室气体排放实际上有相当一部分是其他气体，如N2O(一氧化二氮)和CH4(甲烷)。

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Methane (CH4) is the main constituent of natural gas, and is the result of natural decomposition processes.

甲烷(CH4)是天然气的主要成分，是自然分解过程的产物。

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The effect of this steady accumulation of CH4 in the atmosphere will become the focus of more scientific study, and, increasingly, environmental policy debate.

甲烷在大气中不断积聚的这种效应将成为更多科学研究的重点，从而招致越来越多环境政策的争论。

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A good example of that is CH4, because the CH bond is polar but symmetrically disposed in space.

甲烷就是一个很好的例子，因为极性键是,空间对称的。

麻省理工公开课 - 固态化学导论课程节选

And I picked looking at methane so we could see if there are other factors that we're not considering, that we need to maybe tweak our model a little bit, and I think we'll find that we do if we take a look at a polyatomic molecule, methane, CH4 so c h 4.

我选择甲烷这个例子，我们可以看到,如果有一些我们没有考虑到的因素，我们需要修改一下我们的模型，我们看一看,甲烷CH4这个多原子分子，就会知道这一点，甲烷。

麻省理工公开课 - 化学原理课程节选