Come in Handy 变得有用；派上用场

I bought a new pen today.
That will come in handy for work.
Yes, I needed a new pen.
Especially since you write so much.

我买了一只新笔。
工作上刚好用个正着。
没错，我的确需要只新笔。
尤其是你那么会写。

解说：

我们买了很多东西就是希望能赶快用到它,比如说我们买了支大哥大,就是希望我们在旅行的时候,它能变得很有用,我们可以说, "My cell phone will come in handy because I am going traveling." 还有不要随便乱丢东西喔!"Don't throw it away, it might come in handy some day."谁知道也许有一天,要丢的东西会变得很有用呢?

例句：

When I want to start a fire, my lighter comes in handy.

当我想生个火，我的打火机用个正着。