chance on
phrasal verbchance on/upon somebody/something
- (formal) to find or meet somebody/something unexpectedly or by chance
偶然发现；碰巧遇到 - One day he chanced upon Emma's diary and began reading it.
有一天他偶然发现了埃玛的日记，便开始读了起来。
- One day he chanced upon Emma's diary and began reading it.