This was something we could not predict using Lewis structures, but we can predict using MO theory that we have a radical species here.

这是我们从Lewis结构里不能预测的，但我们可以用分子轨道理论,预测自由基。

麻省理工公开课 - 化学原理课程节选

So far we've exclusively been using Lewis structures any time we've tried to describe bonding within molecules.

目前为止任何时候我们尝试要,描述分子内的成键,我们都是利用Lewis结构。

麻省理工公开课 - 化学原理课程节选