We are not the smartest, so we should remember: diligence is the first and the smart is the second.

我们不是最聪明的，所以我们铭记：认真第一，聪明第二。

youdao

As this thought comes into our head we then remember that our copy of the Hitchhikers Guide to the Galaxy was lent to a friend so maybe we should shoot over to Amazon and buy a fresh copy.

当这种想法出现在脑海中时，我们接下来就会想起《银河系漫游指南》借给了朋友，因此我们可能应该冲到亚马逊网上商城立刻买本新的。

youdao

So, remember: what we saw last time or in the first lecture is that, to rotate a vector by 90 degrees, we should change to.

所以记住，在上次课还是第一节的时候我们知道，要把一个向量旋转90度，我们要把变成。

youdao

So you should remember that any time we combine 2 s orbitals, what we're going to find is if we constructively interfere those two orbitals, we're going to form a bonding orbital.

你们要记住，任何时候我们组合两个2s轨道，我们会发现,如果我们把它们相长叠加，我们会得到一个成键轨道。

麻省理工公开课 - 化学原理课程节选