But there is an expression to get cold feet that has nothing to do with cold or your feet.

VOA: special.2009.12.13

You can imagine what you get: each hours worth of drama, if you like, may be great, but it may have absolutely nothing to do with the other twelve hours.

每个小时的电视剧：,如果你喜欢的话，可能很不错,但是和剩下的12个小时。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's totally legit to cull a function, get back a value, do nothing with it other than compare it to another value.

挑选一个函数是完全合法的，返回一个值，用它来做些事情而不是用它与其它的值比较。

哈佛公开课 - 计算机科学课程节选