didn't like the job much at first.
起初我并不很喜歡這個工作。
The situation was more complicated than they had at first realized.
形勢比他們最初意識到的更為復雜。
At first the place was strange to me.
起先我對這個地方不熟悉。
We left at first light.
我們黎明時離去。
If at first you don't succeed, try, try again.
一次不成功就反復嘗試。