All right, so I did this not at all purposely, but this can point out for you that you need to make sure that the number of electrons that you have in your molecular orbital does match up with the total number that you have in your atomic orbitals.

我并不是故意这么做的，但这告诉我们必须要保证,分子轨道里的电子数,和原子轨道里的,总电子数能对上。

麻省理工公开课 - 化学原理课程节选

I think there are a lot of steps that we can and should take towards mitigating it,

我认为我们有许多方法来减缓气候变暖，而且我们也必须这么做。

喜欢环境法课程 - SpeakingMax英语口语达人