I think last day Professor Ballinger did this one.

我想昨天巴灵格教授应该说过。

麻省理工公开课 - 固态化学导论课程节选

Last day, Professor Ballinger Lewis introduced you to Lewis who taught us that octet stability could be achieved via electron sharing as an alternative to electron transfer.

昨天，ballinger教授,把我介绍给,他教我们八隅律可以,作为电子传递的方式,可以通过共享电子来实现。

麻省理工公开课 - 固态化学导论课程节选