plenty of other fish in the sea直译海里的鱼多得很，引申为天涯何处无芳草，世界上机会多得很。

【例句】
I told her not to worry, she will find another one because there are plenty of other fish in the sea.
我告诉她不要伤心，她会找到另一个，因为天涯何处无芳草。

Don't be sad about the breakup, there are plenty of other fish in the sea.
别为分手而难过，世界上还有很多其他的机会。