断代研究 meaning in Chinese

cohort study

Two issues about the dating study of bronzes of western zhou
西周青铜器断代研究的两个问题
A synthesis study of the date of cave 465 of mogao grottoes at dunhuang
敦煌莫高窟第465窟断代研究综述
Dating on two dunhuang bianwen
敦煌变文断代研究札记二则
As for the previous qin dynasty ' s research , the study of xia dynasty have made progeress , yet many problens haven ' t stllt been resoled
摘要就先秦史断代研究来说，夏史研究虽取得一些进展，但有许多问题尚未解决。