巧遇，偶然发现；

1.

1. 碰巧碰上[发现]：happen in with 偶然和...碰见 | happen upon 碰巧碰上[发现] | happen on 碰巧碰上[发现]

1. find unexpectedly

    e.g. the archeologists chanced upon an old tomb
           she struck a goldmine
           The hikers finally struck the main path to the lake

    Synonym: fall uponstrikecome uponlight uponchance uponcome acrosschance onattaindiscover