Since the 20~th century, because of many scholars efforts, the researches on the salt industry in the Tang Dynasty have gained delightful achievements.
20世纪以来，通过国内外一大批学者的共同努力，唐代盐业史研究被引向前所未有的高度，取得了丰硕的成果。
Since 90es in 20~(th) century, supply chain collaboration has become the new strategy in supply chain management.
从20世纪90年代以来，供应链协同成为新的供应链管理战略。
Its component is White Collar Workers since the 20 ~ th century.
20世纪以来，其主要成分是白领。
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