They became eligible for the Winter Games in 1992, but the NHL has allowed its athletes to go to the Olympics only three previous times: in 1998,2002,and 2006.

VOA: standard.2010.01.12

We can make some substitutions here using some of the derivation on the previous board which will give us the Planck constant divided by 2 pi mass of the electron times the Bohr radius.

在这里我们也可以,用我以前在黑板上写过的一些词来取代它,得到的是普朗克常数除以2π电子质量,再乘以波尔半径。

麻省理工公开课 - 固态化学导论课程节选