It was only when we started to study those that we actually understood how we can best help that population.

只有当我们开始研究这些,才能了解如何帮助到整体。

哈佛公开课 - 幸福课课程节选

But now, when you need more, you can't just say I only want the best bottom land there is.

然而当你需要更多土地时,你不能张口就要这片地区最富饶的土地

耶鲁公开课 - 古希腊历史简介课程节选

Because it can't be right to kill five people when you can only kill one person instead.

我认为当可以只牺牲一个人时,牺牲五人不是正确之举。

耶鲁公开课 - 公正课程节选

So if we go to the ground state, what you see is we're at that lowest energy level, and we only have one possibility for an orbital, because when n equals 1, that's all we can do.

如果我们在基态上，你可以看到，我们在能量最低的态上，只有一种，可能的轨道，因为n等于1，只有这种可能。

麻省理工公开课 - 化学原理课程节选

We can't stand against them anymore and when you start running, the only thing the guys who are left up front can do is run.

我们打不过他们了,而你开始逃跑,留在前面的人唯一能做的也是逃跑

耶鲁公开课 - 古希腊历史简介课程节选