So let's think about methane using valence bond theory.
让我们用价电子成键理论来看一看甲烷。
So the idea behind valence bond theory is very easy to understand.
价电子成键理论，非常容易理解。
The bent bond states mainly appear near the top of valence band.
弯键态主要出现在价带顶附近。
The bent bond states mainly appear near the top of valence band.
弯键态主要出现在价带顶附近。
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