She read quietly in the library.
Meaning: This means she was silently understanding written or printed matter in the library.
Choice of Words: Read means to look at and understand written or printed matter. Quietly means in a silent or hushed manner. Library is a place where books and other materials are kept for use by the public. When you put them together, the sentence means that she silently looked at and understood written or printed matter in the library.
Alternative Expressions
Related Expressions