1. 有用的;方便的
    Something that is handy is useful.

handy的意思

    e.g. The book gives handy hints on looking after indoor plants...
           这本书提供了一些关于如何照料室内花草的有用信息。
    e.g. Credit cards can be handy — they mean you do not have to carry large sums of cash.
           信用卡很方便，有了它你就不用携带大量现金了。

2. 派上用场
    If something comes in handy, it is useful in a particular situation.

handy什么意思

    e.g. That key will come in handy if you lock yourself out...
           要是你把自己锁在了屋外，那把钥匙就派上用场了。
    e.g. The $20 check came in very handy.
           那张20美元的支票正好派上了用场。

3. 手边的;附近的
    A thing or place that is handy is nearby and therefore easy to get or reach.

    e.g. It would be good to have a pencil and paper handy...
           最好在手边准备好纸和笔。
    e.g. Keep handy a lightweight sweater or cardigan...
           手边备一件薄的套头毛衣或开襟毛衫。

4. 手巧的;有手艺的
    Someone who is handy with a particular tool is skilful at using it.

    e.g. If you're handy with a needle you could brighten up your sweater with daisies.
           如果你针线活做得好，可以在自己的毛衣上绣几朵雏菊做点缀。