long time no see
US /lɔŋ taɪm noʊ siː/
UK /lɔŋ taɪm noʊ siː/

1.
好久不见, 久违了
a greeting used when you have not seen someone for a long period
:
•
Oh, Sarah! Long time no see! How have you been?
哦,莎拉!好久不见!你最近怎么样?
•
After ten years, he greeted his old friend with a warm, "Long time no see!"
十年后,他热情地对老朋友说:“好久不见!”