And also they're accurate over 90% of the time.

而且他们在90%的情况下都是准确的。

麻省理工公开课 - 化学原理课程节选

But they're not accurate all the time in predicting bonding within molecules, and the reason for this is because Lewis structures are not, in fact, based on quantum mechanics.

但它们在预测分子内,成键时不总是正确的，这是因为Lewis结构，实际上不是基于量子力学的。

麻省理工公开课 - 化学原理课程节选