Hayley教口语，“常言道”用英语怎么说？

to coin a phrase

something you say before using an expression that has been very popular or used too much

套用一句流行的话;常言道;俗话说

I was, to coin a phrase, gobsmacked!

套用一句老话，我简直目瞪口呆!

Well, we can't do anything about it now, so“que sera sera”, to coin a phrase.

我们现在也无能为力，所以就顺其自然吧。

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