For Pu Yuan to be able tell what proportions of water from different rivers there were in a bucket may be rather too much of a fairy tale, but there is indeed a science to which water one uses for quenching.
蒲元能夠分辨水桶裡有多少比例的蜀江水與涪江水，或許過於神話；但是用什麼水淬火，在科學上確實有講究。