〔a t〕點 用？

1. 在...地點
They were already waiting at the gate when I got there.
當我到達那裡時,他們已等候在門口了。
2. 在...時刻
Jane will meet her boy friend at Christmas.
珍將在耶誕節和她男友見面。
3. 向,朝,對著
Don't shout at me.
別對我叫喊。
4. 在...方面
He is an expert at troubleshooting.
他是位排解爭端的能手。
5. 因為,由於
I woke at the sound of the bell.
隨著鈴響,我醒了。
6. 從事於,忙於
He is working hard at this thesis.
他正在努力地撰寫論文。
7. 以(某種價格,速度等)
They sold the cloth at a dollar a yard.
他們以每碼一元的價格出售這種布。