And in physics, when physicists want to say "a little bit of," delta they write lower case delta.

在物理里，他们想要表示一点点这个概念时“,常在值前面写。

麻省理工公开课 - 固态化学导论课程节选

But just to be really clear, I've written out exactly which equations you do have to memorize on the front here, so long as you know those, the rest you can just look up.

但是让大家清楚，我已经,把大家需要记住的公式都写在前面了，只要你知道了这些，其它的就只需要查了。

麻省理工公开课 - 化学原理课程节选

And, just to show some of the hidden balance here, 1 here we have one mole. I don't put a one in front.

这儿有一些隐藏的平衡，比如说这个1摩尔，我并没有在前面写了一个。

麻省理工公开课 - 固态化学导论课程节选

You can write on the front. You can write on the back.

你能写在前面，也能写在后面。

麻省理工公开课 - 固态化学导论课程节选