Previewing material can help you understand it by giving you a rough idea of what to expect to learn from the material and what is being presented by the material. While it helps you a little bit, there is no substitute for reading the material.
Previewing shows you the pieces to the puzzle. Reading shows you how the little pieces to the puzzle all fit together. Without knowing all the pieces, you might miss something. Without knowing how these pieces fit together, they will be less useful and you might not solve the puzzle completely.
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