中国折扇出现在约1600年前，成为流行600年后，这是中国北宋王朝。
Chinese folding fan appeared about 1600 years ago, and became popular 600 years later, which is Northern Song dynasty in China.
在黄河防治中，北宋王朝逐渐形成一套较为完整的官员奖惩机制。
A comparatively complete series of official mechanism of rewards and punishments in the Yellow River flood prevention was formed in the North Song Dynasty.
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