come in handy

动词 come in handy:

1. be useful for a certain purpose

1. Do not throw that plastic bag away; it may come in handy.
   别把那个塑胶袋扔了，会用得著的。
2. Don't throw that cardboard box away it may come in handy.
   不要把那个纸盒丢掉--可能用得著。
3. These books will come in handy.
   这些书将来会有用的。
4. A few more traveller's cheques may come in handy on the holiday.
   多带几张旅行支票，度假时会有用的。