龙门石窟莲花洞建于北魏,多年以来因其岩体具可溶性,又受裂隙切割而损害严重。
The Lotus - flower cavity grotto was founded in Northern - Wei dynasty. For a long time, it had been corroded badly because of its dissolubility and the incision of cranny.
乐户是自北魏立乐籍以来从事各种官方及民间文化娱乐活动的特殊社会群体。明代是乐籍制度急遽变迁的重要时期。
The Ming dynasty was the important period of that the system of registered musician household was in the state of rapid flux.
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