概念,确实不太好懂,但是总体上说,它是一个有根的有向无环图 a rooted
"rare"是"rooted and reaching everywhere"的英文缩写,意思是"根深蒂
编辑1基本内容疔疮(nail sore;deep-rooted boil;hard furuncle),又名
pudong the synonym of innovation in shanghai
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