三大發明 sān dà fā míng詞典解釋:中國古代的三種大的發明:火藥、活字印刷和指南針。[the three major inventions by the Chinese——gunpowder, p... [详细]
2022-02-09 05:10:00
2021-10-31 05:29:00
2022-02-04 21:43:00
2021-11-08 01:47:00
2021-11-07 22:34:00