nonexistent code

基本解释

I remember struggling with the source code and debugger to figure out how to achieve certain effects because the documentation was nonexistent. Those days are gone.
我还记得当时和源代码与调试器搏斗以便获得特定效果的情景，因为当时还没有文档，那种情形不复存在了。
Documentation was almost nonexistent (I had very worn copies of the two [Leffler et al.] documents from the 4.3BSD manual set) so when you needed an answer, you looked it up in the source code.
当时几乎没有文档可查（我从一堆4.3BSD手册中找到两本Leffler等人编写的文档，但非常破旧），因而在想解决某个问题时，就得查源代码。
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