求翻译：开封古称东京、汴京，简称汴。北宋开封是当时世界最繁华、面积最大、人口最多的大都市。但也曾多次被黄水淹没，有“城下之盟”、被迫南迁之耻。是什么意思？

Kaifeng ancient name of Tokyo , Bianjing , referred to Bian .

开 ancient 称 东 closure, Beijing and Bianjing, 简 称 Bian. The Northern Song dynasty 开 seal is 当 时 华 world's most ensure 积, the largest and most populous cities. But the company has been 黄 flooding 没, "City of the South 迁" and forced the 耻.

Kaifeng ancient name Tokyo, the Kaifeng Beijing, is called Kaifeng.The Northern Song Dynasty Kaifeng's was the world is at that time liveliest, the area is biggest, population most metropolises.But also once many times does not have by the yellow flooding, had “the treaty signed under coercion”, bei

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