What does Wei mean in Bian Wei's Three Musts?

1, Wei Yi's three wonders in Bian Wei mean: soft leather made of depilation.

2. Bian Wei's Three Musts means: Bian Wei: weaving bamboo slips with cooked cowhide ropes; Three: divisor, which means many times; Absolutely: broken. The leather rope for weaving bamboo slips has been broken many times. Metaphor is studying hard.

3. The origin of Bian Wei's three wonders: from the Western Han Dynasty? Sima Qian's Historical Records? Confucius family:? The three works compiled by Reading Yi and Wei have their own characteristics. ?