stumble across/on/upon sth/sb
意外发现；偶然遇见
to discover sth/sb unexpectedly
Police have stumbled across a huge drugs ring.
警方无意中发现一个庞大的贩毒集团。
I stumbled across an extremely simple but very exact method for understanding where my money went
我意外发现了一个非常简单却能精确了解我所花钱去向的方法。
If your timing is right, you may be fortunate enough to stumble across a village fiesta.
如果你时机把握得好，你会幸运地撞上某个乡村节日。
I stumbled across this silver bracelet in the junk shop down the road.
我在马路边的那家旧货商店里，无间中发现了这个银手镯。
History relates that they stumbled on a magnificent waterfall.
历史上记载他们曾意外地发现了一处壮观的瀑布。
I stumbled on the book at the library.
我碰巧在图书馆里发现这本书。
Workmen stumbled upon the mosaic while digging foundations for a new building.
工人们在挖一栋新楼的地基时偶然发现了那幅镶嵌画。
注意：
stumble into sth
无意间涉足某事
to become involved in sth by chance
I stumbled into acting when I left college.
我从大学出来后无意间进了演艺界。