How to explain Zhang Xiwen's stunts in Qilu San Jue?

China's calligraphy with clear strokes and accurate figures, with both hands carrying out positive and negative strokes at the same time. Zhang Xiwen, a teacher who is near flowers, looks younger than his actual age and is optimistic and open-minded in his speech. It is famous all over the country for its "clear strokes of Chinese characters", "accurate addition of numbers" and "calligraphy with both hands", and is called "Qilu Three Musts". No matter how long and difficult it is to write Chinese characters, he can say the strokes of Chinese characters in one bite. No matter how many numbers are added up, he can calculate faster than the computer, and the accuracy rate is 100%. The third item is "calligraphy with both hands at the same time". Teacher Zhang Xiwen, a native of hou zhuang Village, Shibuzi Town, Anqiu City, and Zhang Lao participated in the programs of major TV stations in China, and signed CCTV's "Colorful China People" program to attend the program in Beijing.