You'll also know that all of these binding energies here are negative, so the negative sign indicates that it's low.

你们将会知道所有的这些,结合能都是负的。

麻省理工公开课 - 化学原理课程节选

So we have if, and that is followed by, I'm going to use angle braces here just to indicates something goes in here, some test followed by a colon.

那么我写了if，后面跟着，我这里会用一个角括号,来代表这里有些东西，冒号后面跟着一些测试。

麻省理工公开课 - 计算机科学及编程导论课程节选