俗话说英语翻译

it is said that...there is an old saying that...Well goes an old saying,...As an old saying goes(runs,says),...It is an old saying(that)

as the old saying

Astheoldsaying/folksay/colloquialismgoes后面再加句子就OK了

as the saying goes，平时应多提升词汇量的，这太简单了

as old saying goes.

There is an old saying....