My friends in Australia said that Chinesehistory was very hard to understand.
我澳大利亚的朋友说中国历史很难理解。
The Museum of ChineseHistory displays three critical periods of Chinese history.
中国历史博物馆主要呈现了三个重要时期的中国历史。
Du Yucai's dialect study paid attention to the comparison. Its materials and methods were for reference to Chinesehistory and modern Chinese dialect study.
段玉裁的方言研究注重目验和历时、共时的比较，其材料及方法可供汉语史和现代汉语方言研究参考。
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