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Yeah, this lack of knowledge in what exactly we're reading (except for a few oft-occurring words here and there) can be seen in the inability to read, say, an Arabic newspaper. Written Arabic heavily omits the equivalent of vowels in Arabic (fathah, kasra, lamma, sukoon) since those can be figured out with context.

So, even if I can fluently read the Quraan, I wouldn't be able to figure out the right way to read a simple poster.