at the before of

at the before of

at the before of
在,,,,,之前
before
英 [bɪˈfɔ:(r)] 美 [bɪˈfɔr,-ˈfor]
prep.
在…之前;先于，优于;当着…的面;与其…
conj.
在…之前;在…以前;比…早些;与其…
adv.
先前，从前;在前，在前方

When you're done, you can look at the before and after versions of the exampleapplication and review how you've improved it.
全部完成后，查看示例应用程序改进“之前”和“之后”的版本并回顾改进的过程。

at the before of 之前的 再看看别人怎么说的。