A substantial proportion of the population speak a French-based patois.

此人群中很多人说一种以法语为基础的混合语。

《柯林斯英汉双解大词典》

It's extremely interesting if you can ever get a chance to meetsomeone who speaks Patois and for someone who speaks French. You will never be able tounderstand them even if you speak French.

这其实非常有意思，如果你有机会认识说克里奥尔语的人，即使你会说法语，你也无法明白他们在说什么。

youdao

And then if you go up, you think, well they spoke French there, certainly in Normandy, but they spoke in many parts a patois.

然后你要是北上,你觉得那该说法语了吧,在诺曼底一些地方是,但是还有好多种方言

耶鲁公开课 - 1871年后的法国课程节选