Moreover, instead of having a strap he had this thing that--a rigid thing-- that you pull out from this-- you know what I'm talking about?

而且他也没用皮带,而是用的现在大家都知道的把手去拖-,你们知道我说的什么吧？

耶鲁公开课 - 金融市场课程节选

Some may or may not be useful, but you just don't know.

有些可能有用,有些可能没用,但你们现在还不知道

耶鲁公开课 - 基础物理课程节选

Now, less than is just, if you haven't used it before, it's just the operator you'd expect, it's comparing two things and it's going to return either true or false depending on whether the first argument is false less than the second argument.

现在，小于这个符号是，如果你之前没用过它的话，它就是你期望的那个运算符，它会比较两个独享,然后基于第一个参数是不是,小于第二个参数,返回true或者。

麻省理工公开课 - 计算机科学及编程导论课程节选