But when we're thinking about actual wave behavior of electrons, it's just important to keep in the back of our head that some areas have positive amplitude and some have negative.

电子的波动行为时,我们，要记住,某些地方是正的,某些地方是负的,当我们讲到。

麻省理工公开课 - 化学原理课程节选

I feel like I'm very, I try to keep it very positive with people.

我觉得我很，我试着让自己积极待人。

幸福的定义 - SpeakingMax英语口语达人