lo and behold
US /loʊ ənd bɪˈhoʊld/
UK /loʊ ənd bɪˈhoʊld/

1.
不料, 瞧
used to present a new and surprising event, often a sudden appearance
:
•
We searched everywhere for the lost cat, and lo and behold, she was sleeping on the couch the whole time!
我們到處尋找丟失的貓,不料,她一直睡在沙發上!
•
He opened the old chest, and lo and behold, it was full of antique coins.
他打開了舊箱子,不料,裡面裝滿了古董硬幣。