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 Bond-space theory is the development of the bond graph theory of system dynamics.
键合空间理论是系统动力学键合图理论的拓展。
The Bond-space theory is the development of the bond graph theory of system dynamics.
键合空间理论是系统动力学键合图理论的拓展。
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