Cai Lun invented paper around 2, 000 years ago in China.
大约2000年前，蔡伦在中国发明了纸。
Paper was first invented about 2,000 years ago in China.
纸大约是2000年前在中国发明的。
Paper was first invented about two thousand years ago in China by Cai Lun.
大约两千年前，中国的蔡伦首次发明了纸。
Paper, one of the four greatest inventions in ancient China, was invented by Cai Lun about 2, 000 years ago.
纸是中国古代四大发明之一，大约在2000年前由蔡伦发明。
纸是中国发明的。
纸是中国发明的。
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