In the ming dynasty scientist song yingxing thought too , " ancient piece of jade in the so - called liancheng " , was " jade in the uncut jade " 明代科学家宋应星也认为， "所谓连城之璧" ，是"璞中之玉" 。
2.
Jade of uncut jade , have vertical - horizontal ruler on person who has no time flaw in a piece of jade , ancient emperor is it think the imperial seal to fetch , the ancient piece of 璞中之玉，有纵横尺于无暇玷者，古帝王取以为玺，所谓连城之璧，也不易得。
