Owing to the long history, there are some puzzling problems in historical literature recordation.

但由于历史久远，历史文献记载尚有不少疑难问题。

youdao

Owing to the long history, there are some puzzling problems in historical literature recordation.

但由于历史久远，历史文献记载尚有不少疑难问题。

youdao