说明：  This book presents the complete essentials that make up a computer. It presents every piece and part, in the proper order so that each one will make sense, and can be understood. Every part is explained fully, and every new word is defined thoroughly when it is first used. Any attempt to simplify the subject further would leave gaps in the big picture where someone would still have to guess how the parts work together, and you just wouldn’t ever have that “Aha, I get it!” moment that I think you’ll soon have.