This says, I need a second argument to it, and that second argument better be a point so I can do the comparison.

这里我需要第二个参数，第二个参数最好是一个点,这样我就能做比较了。

麻省理工公开课 - 计算机科学及编程导论课程节选

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