So, if you use a black lamp or something and you excite something up to a higher energy level and then it relaxes back down to its lower energy state, it's going to emit a new wavelength of light, which is going to be visible to you.

如果你用一个紫外灯或别的,东西把某种分子激发到,更高的能级，然后它会掉回,到低能级，它就会释放,一个新的波长的光,这个光是可见的。

麻省理工公开课 - 化学原理课程节选

It is clear that we can change happiness levels,up or down."

显然，我们能改变快乐水平，变得更高或更低“

哈佛公开课 - 幸福课课程节选

And we need to ask in the case of higher or worthier pleasures are there theories of the good life that can provide independent moral standards for the worth of pleasures?

我们要问，就更高的或更有价值的快乐而言,是否存在“良善生活“的理论,能为快乐的价值,提供独立的道德标准？

耶鲁公开课 - 公正课程节选

In other places, infectious disease is a much bigger part of their life and a much greater risk of death from infectious diseases and parasitic diseases if you live in places other than the U. S. or Western Europe, for example.

在其他地区,感染性疾病,对当地人们的生活构成了更大威胁,他们死于感染性疾病或者,寄生虫之类疾病风险更高,如果你生活在,美国或欧洲之外的地方的话

耶鲁公开课 - 生物医学工程探索课程节选

You can search obviously by any of the fields up top by days ; of the week you want a class; days of the week you don't want a class; grad level or undergrad level, faculty scores that are 4.0 and higher, ; course overall scores that are 4.0 and higher; and a whole number of other features including synchronization with Google calendar.

你可以按日期来搜索网页上的任一科目,以决定哪天去上课，哪天不去上课;,研究生课程或本科生课程,教师打分为4分或更高的课程，课程总学分为4分或者更高的课程;,当然很多其他选择方式,包括Google同步日历。

哈佛公开课 - 计算机科学课程节选

Just as forewarning for people who have forgotten what a median is, that means half of you--not approximately half, it means exactly half of you-- will be getting something like B+ and below and half will get something like B+ and above.

稍微提示下忘记中位数含义的同学,这也就是说,不是一半左右,是绝对一半的同学,会得到B+的成绩或更低的成绩,另一半会到B+的成绩或更高的成绩

耶鲁公开课 - 博弈论课程节选