作為農業文明領先世界一千多年是沒有疑問的，單個國家比較的科技貢獻也是可觀的

來源: 楊別青於 2023-12-03 08:50:02 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.