The system can be an open system, or it can be a closed system, or it can be isolated.

系统可以是开系，可以是闭系，或是孤立系。

麻省理工公开课 - 热力学与动力学课程节选

All right. The other thing I have to teach you is matter-energy interaction so that we can see how the Balmer series validates the Bohr model.

好的，我要教你们的里一个知识点是,物质能量的相互作用，我们可以见证,巴尔末线系是怎样证实波尔模型的。

麻省理工公开课 - 固态化学导论课程节选

So a closed system would be, for instance, a glass of ice water with an ice cube in it, with the lid on top.

因此闭系可以是，比如说，一杯放了,一个冰块的冰水，顶上加了盖子。

麻省理工公开课 - 热力学与动力学课程节选

This pluripotent stem cell is able to self-renew and it's able - generating committed progenitors of either the myeloid or the lymphoid lineage.

这种多能干细胞能自我更新,也可以生成定向祖细胞,可以是髓系祖细胞或者淋巴祖细胞

耶鲁公开课 - 生物医学工程探索课程节选

And a lot of the strikes that you see in high schools and in-- I better get to my lecture,but-- you see in high schools and even in middle schools, have to do with the State,somebody saying, well we're going to take away two-hundred teachers in your department, or we're going to maintain a curriculum that doesn't seem to make any sense.

在高中里可以看到很多罢课,我最好回到正题,但还是再讲一点,在高中,甚至在初中有很多罢课,为了反对政府的某项规定,比如说要在这个系减少两百个教师,或者主张一份,完全不合理的课程安排

耶鲁公开课 - 1871年后的法国课程节选

We can think about the Lyman series, which is 1 where n equals 1. We know that that's going to be a higher energy difference, so that means that we're going to be in the UV range.

我们可以来看看Lyman系,也就是n等于,我们知道它的能量差更大,所以它在紫外光区内。

麻省理工公开课 - 化学原理课程节选

You don't need to know those, but just because it's a special case with the hydrogen atom, they do tend to be named -- the most important, of course, tends to be the Balmer series because that's what we can actually see being emitted from the hydrogen atom.

你们不需要记住,但因为这是氢原子的特例,人们想要命名它，最重要的是当然是Balmer系,因为它是我们可以看到的,从氢原子放出来的光谱。

麻省理工公开课 - 化学原理课程节选