Freud came in handy; she quoted him often.

佛洛伊德用起来倒是顺手；她常常援引他。

The English he learned in high school came in handy when he worked.

他中学学的英语在他工作时证明很有用。

This came in handy since if I got a new notification, I could tell immediately.

当我有新通知时，这一点绝对可以派上用场，这样我就可以立马进行处理。

Still, Luna’s random, “useless” cache of information often came in handy to help Harry.

但是就是这些卢娜不经意间了解的小知识往往能够帮到哈利的忙。

That's where my training came in handy, basically like remembering your steps with your partner.

这就是我的训练派上用场的时候了，基本上就像和你的搭档一起记住你的步法。