笔墨纸砚是中国古代文人书房当中必备的宝贝，被称为“文房四宝”。用笔墨书写绘画在中国可追溯到五千年前。秦时已用不同硬度的毛和竹管制笔；汉代以人工制墨替代了天然墨；有了纸张以后，简牍锦帛逐失其用；砚台则随笔墨的使用而发展。 “文房四宝”到宋朝以后特指湖笔、徽墨、宣纸、端砚。可以说文房四宝书写了整个中华文明。

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might eventually pass his baton to a member of the Seventh Generation. In accordance with the succession practices established in the 1980s by “Great Architect of Reform” Deng Xiaoping ...

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The gritty cyborg flick could have gone to the dustbin. Forty years later, James Cameron’s creation — and his dystopian ...

重新回归党内的原来本色，是「国家主席终身制」为干部屈从于他统治的新口号。 但与此同时,中美「贸易战」和国内经济 ...

Note: For a definition of unfamiliar terms, see our glossary. The fundamental particles of the universe that physicists have identified—electrons, neutrinos, quarks, and so on—are the "letters ...

What a great question! In fact ... But we can try and imagine what the edge of the universe might be, if there is one. Before we begin, we do need to go back in time. Our night sky has looked ...

As the radiation is very old, when we make measurements of the CMB today, we are learning about the conditions of the early universe. But detailed mapping of the CMB tells us a great deal more ...