what's the differences between play a role in and play a part in?

你的东西有错误
也许大概可能是what are the differences between play a role in and play a part in?

play a role in 在...中起一定作用；

play a part in 在...起作用
两者就是在起作用的程度上有区别了。

用了is,different还用复数啊,真是

你是想问什么东西啊？是翻译还是什么？说清楚