I'm new here so I'm not completely au fait with the system.

我初来乍到，所以对这个系统还不完全熟悉。

They became increasingly annoyed that they were being presented with a fait accompli.

他们对面前呈现出一个既成事实越来越恼火。

If I fait, I only have to get up again.

如果爱情失败了，我只要再爬起来就可以了。

In French, the same saying exists: singe qui voit, singe qui fait.

法语中也有这样的说法：singe qui voit, singe qui fait。

It's my first week here so I'm not yet au fait with the system.

我刚来不到一个星期，对这里的制度还不太熟悉。