And J.J. Balmer in 1885 playing with the numbers asociated with the lines there, you notice how the lines are colored?

885年，巴尔末,开始把光线与数字联系起来，你注意过光线是怎样被赋予颜色的吗？

麻省理工公开课 - 固态化学导论课程节选

We've always been looking for the oldest Confederate widow, in case you haven't noticed.

我们一直在寻找现存最年长的南部邦联寡妇,要是你注意过这方面消息的话

耶鲁公开课 - 美国内战与重建课程节选