関連ワード:
how did the song dynasty maintain power how did the song dynasty maintain power for over 300 years how did the song dynasty stay in power how did the song dynasty keep power how did the song dynasty maintain their power how did the song dynasty government maintain power how did the tang and song dynasties maintain power how did song china maintain power how did the tang and song dynasties gain and maintain power over people and territories how did the civil service exam help the song dynasty to maintain power
