为什么需要划分“学科”为什么要划分“学科”呢?如果用一句话回答,就是:世界太大了,宇宙太广了,历史太长了,知识太多了。你了解地球吗?地球的直径是1万2千多公里,年龄是40~46亿岁。宇宙呢?宇宙的直径可达到920亿光年,年龄大约为138.2亿岁。学者们通常把中国古代分为上古、中古、近古,汉代以前就算上古了。“上古”很古吗?钱钟书先生的夫人杨绛先生活了105岁,周有光院士活了112 Why do we need to classify “disciplines” as “why?” If you answer in one sentence, then: The world is too big, the universe is too wide, history is too long, and there is too much knowledge. Do you know Earth? Earth’s diameter is more than 12,000 kilometers, the age is 40 ~ 46 billion years old. Universe? The diameter of the universe can reach 92 billion light-years, about 13.82 billion years old. Scholars generally divide ancient Chinese into the ancient, the Middle Ages, and the ancient, even before the Han Dynasty. “Antiquity ” very old? Mr. Qian Zhongshu’s wife Yang Jiang lived 105 years old, Zhou Youguang academicians alive 112