turn at和turn for都是转向的意思，有区别为

turn at释义：

将在

例句：

I went aft to take my turn at the helm.

我到船尾去接班掌舵。

He's obliged to take his turn at reading out the announcements.

他不得不依次等着轮到自己大声读出通知

turn for释义：

转

例句：

Well, that's my good turn for the day.

好啦，这就是我今天做的好事。