This is code that's got to be executed before anything else happens.

这个代码是,在所有事情发生之前执行的。

哈佛公开课 - 计算机科学课程节选

kind of one of those things that happens right before you at the end of the year,

在年底毕业之前，这样的过程也会发生，

实习生到正式员工 - SpeakingMax英语口语达人

all of that happens in 2D before they converted to 3D.

这类2D转为3D之前做的事情。

如果在皮克斯工作 - SpeakingMax英语口语达人