common sense judgement

Twelve solar calendars: A calendar created by Shen Kuo, a scientist in the Northern Song Dynasty, which is similar to the present solar calendar.

Powder comes from alchemy.

Shen Kuo. -I won't explain this.

Tokyo was the capital of the Song Dynasty, or rather the Northern Song Dynasty, which is today's Hangzhou. As for Washi, it also refers to a special singing place in Tokyo, the capital of the Northern Song Dynasty.

E, Baidu

I. Errors

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