C2304 Caught Unprepared

There were three ancient methods to judge a stone: Clear, Break, and Clear.

However, good eyesight was not based on talent that surpassed others, but on experience. If a piece of grey hair was placed in front of one's eyes, judging by its appearance, it might be arbitrary, but an experienced expert would be able to see through some of it.

It was also the so-called peeping Leopard in a pipe