"Deep," in this case,means deepest.

VOA: special.2009.05.24

So what's going on in this case is, I want to distinguish between shallow equality and deep equality.

第一件事情就是,测试浅意义上的相等，这什么意思呢,这是个不太好的英语句子。

麻省理工公开课 - 计算机科学及编程导论课程节选