Extensive reading: the radical "Guang" of Kuang is simplified to "Guang". Save strokes and simplify them according to ancient calligraphy.
The original meaning of vastness: vastness. Such as: empty, vast, wild, sparsely populated. ?
Broad extension: extension refers to "cheerful and open-minded", such as: broad-minded and relaxed. Extension means "waste, delay", such as absenteeism, protracted, extended life. It is extended to "nothing for a long time", such as: great men in the open era (unparalleled great men in the contemporary era), great men in the open era, and grand ceremonies of prosperity. Also used as a surname.