1, this sentence means that a reader can learn about the outside world by reading books and newspapers even if he stays at home. Know what's going on outside, although stay at home.

2. "Scholar" is the general name of students in Ming and Qing Dynasties (scholars who passed the examination and were admitted to schools in Shangguan, Zhou and County), which generally refers to scholar here.

3. In the past, when the transportation and information industries were underdeveloped, the world we could learn by reading books and newspapers was very limited. Today, with the development of transportation and information industry, with the help of multimedia computers and the information superhighway running through the world, you can get the latest information from all over the world while sitting at home, and truly "scholars don't go out, and the world knows it".