black and white 非黑即白的，白纸黑字

【例句】
I don't understand why you don't believe me! Look, it's written here in black and white!
白纸黑字摆在这，你为什么就是不信我！

Our boss always thinks that everything is straightforward, but he doesn’t realize that this whole situation is not as black and white as he thinks!
老板想问题总是太简单。他根本意识不到情况并非像他想的那样非黑即白！