About the sixth century A.D.when few Europeans could read,the Chinese had invented paper.这句话后面是主句我知道,但是前面的关系我有点搞不懂 About the sixth century A.D.是时间状语?when few Europeans could read不是也是

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About the sixth century A.D.when few Europeans could read,the Chinese had invented paper.
这句话后面是主句我知道,但是前面的关系我有点搞不懂 About the sixth century A.D.是时间状语?when few Europeans could read不是也是么 那两个时间状语直接连起来怎么那么别扭

句子的意思是:大约公元6世纪,当少数欧洲人会识字的时候,中国人已经发明了纸张.
About the sixth century A.D.是介词短语作时间状语,表示的是比较具体的世纪,相当与一个时间点,而when 是连词,引导一个时间状语从句
两个状语之间可以加逗号About the sixth century A.D.,when few Europeans could read
也可以直接像原句