come in useful
to be useful and help someone to do or achieve something
派上用场，有帮助
You should keep that paint - it might come in useful one day.
你应该留着那些油漆——说不定哪天会派上用场。
Extra blank paper will probably come in useful.
额外的空白纸可能用得着。（素材来源网络，如有侵权请联系删除）
