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Theory is the forerunner of practice, and thought is the guide of action. Rich reserves of theoretical knowledge can guide your every practical action, broaden your horizons, and share knowledge every day. Let's check for omissions and make up for vacancies. ps. This circle is a circle of "learn the theory well and worry about everything". Without authorization and permission, any user is not allowed to post irrelevant discussions in this circle. Violators will have relevant content removed from the shelves. 
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