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This work is a collection of essays by retired professor Feng Qingyan of the High School Affiliated to Tsinghua University. Mr. Feng recorded his profound understanding of education and profound thinking about life in more than 40 articles. From these contents, we can feel the love of education work of the older generation of educators in New China and their unremitting efforts to develop the education industry of the motherland. Their rigorous and serious working methods, optimistic and open-minded attitude towards life, and positive mental state are all worth learning from.

The origin is mysterious and the identity is a mystery! The amnesiac brain keeps awakening various black technologies, and there are many secrets hidden in the body! On this day, Hero appeared on the earth - on the surface!