Currently reading: Reading Like a Writer by Francine Prose 📚

And on page 40, this quote:

Finally—and there is no way to convey this unless you read the sentence aloud or at least, as your first grade teacher cautioned you not to do, say it silently, word by word, in your mind

What are they teaching kids in American first grade? What does she mean, you were taught not to say it word by word in your mind? How do you read without doing that? Or at least learn to read?