on hand
手头
A:You're starting to learn English?
A:你开始学英语了?
B:Yeah. I like it, Dad.
B:是的，爸爸，我喜欢英语。
A:You're lucky you start to learn it so early. I learned English very late, and learned it all by myself. At that time we didn't have a good English studying environment. I have to keep my dictionary on hand.
A:能这么早学英语你真是很幸运，我学英语就很晚，而且都是自学，那时我们学英语的环境不太好，我不得不总把字典放在手边。
B:Really?
B：真的吗?