There are other fish in the sea.

你不必单恋一枝花。

Plenty of other fish in the sea.

天涯何处无芳草嘛。

There's plenty of other fish in the sea.

天涯何处无芳草。

Yeah, y'know what, there are other fish in the sea.

你不必单恋一枝花。

" There are other fish in the sea (in the ocean)" meaning there are other women out there that you can find to be your girlfriend – maybe!

“There are other fish in the sea (in the ocean)” 意思是你可以在外面找到其他女人做你的女朋友——可能是！