at the first time和for the first time有什么区别

at the first time 是介词短语，指“第一次，在第一时间”，在句子中做时间状语，如：
I read this essay at the first time.
我第一次读到这篇文章是在1988年。
We will write back at the first time.
我们将写回在第一时间。
for the first time 指“起初”,在句子中做时间状语，如：
For the first time in my career, I was failing.
我职业生涯中第一次经历失败。
It's best not to try a new recipe for the first time on such an important occasion.
在这么重要的场合最好不要尝试以前从未做过的新菜谱。

for the first time 做时间状语,意思为第一次
例句：
1.With audiences in the US falling for the first time in a generation, Hollywood is girding itself for recession.
随着美国的电影观众人数在二三十年里首次下跌，好莱坞正在为萧条期做好准备。
2.Jobs was famous for taking meetings on foot, especially when he was meeting people for the first time.
乔布斯以边走路边开会而闻名，尤其是对初次见面的人更是如此。

at the first time 做时间状语,意思为起初
例句：
1.And you wont necessarily succeed at everything the first time you try.
你第一次尝试做每件事的时候，不一定成功。
2.Step1: Watch soundtrack movie ( of course!!) and watch it with the subtitle on at the first time.
第一步：看有声电影（囧不是废话嘛~），第一遍的时候带着字幕看。