So if you have some region of space S and you call its boundary surface S and you let n be the normal vector that goes out of the region R.

如果存在一些区域空间,边界为曲面,定义n为指向区域R外的法向量。

youdao

On the contrary, rock 'n' roll might cheer you up and help you let out emotions.

相反地，摇滚乐可以让你精神一振并释放情绪。

youdao

So what we'll do is this problem here, which is let's calculate out what the wavelength of radiation n would be emitted from a hydrogen atom if we start at the n equals 3 level and we go down to the n equals 2 level.

我们来做这个问题,让我们来计算一下,从n等于3到,等于2能级氢原子辐射的波长是多少。

麻省理工公开课 - 化学原理课程节选

Let your smart card and the pop machine duke it out. n Only the best of breed will cut it in the age of infinite and zero.

FORBES: Digital rules