短语 at hand 的意思是指某物近在手边，就在眼前以方便使用。

例句

I don't have any printouts so keep a pen and paper at hand during the lecture.

A few years ago I was in my car when it got stuck in snow. Now whenever I drive in winter I keep blankets and a hot drink at hand.

请注意

短语 by hand 的意思是 “手工制作的”。

例句

I always prefer to make bread by hand. I don't like the stuff you get from the supermarket.

My brother made this bookcase by hand. He's a very talented carpenter.