And then since we have my red laser pointer, we will also try with the red laser pointer, which is centered at wavelength of 700 nanometers.

然后因为我们有我的红色激光笔，我们也可以用它试一下，它的波长集中在700纳米处。

麻省理工公开课 - 化学原理课程节选

We have a UV lamp right here, which is centered at a wavelength of 254 nanometers.

我们有一个紫外灯在这里，波长集中在254纳米处。

麻省理工公开课 - 化学原理课程节选

This bond is polar, but again, as I alluded to earlier, because the carbon is centered in the tetrahedron, because of the sp3 hybridization, the molecule itself is symmetric and nonpolar.

这个键是非极性的，但是，我们断言过早，因为C是中心原子，由于sp3杂化，这个分子本身是非极性的且对称的。

麻省理工公开课 - 固态化学导论课程节选