It's always good when we're looking for a wavelength that our answer is in a unit of length, that's a good sign already.

当我们计算波长时,如果答案是一个长度单位，那就是一个好的迹象。

麻省理工公开课 - 化学原理课程节选

That's a new unit of length.

那是一个新的长度单位

耶鲁公开课 - 基础物理课程节选