求翻译：1.按照北京市的资源、环境承受力，能够承担的理想极限人口是1800万。但现在在北京市的常住人口已经超过1900万，瞬间人口高峰已达2100万。（此问题可回答为何说一线城市已经饱和）是什么意思？

1 in accordance with Beijing's resources, environmental endurance, able to assume the ideal limit population is 18 million. But now the resident population in Beijing has more than 19 million instant population peak reached 21 million. (This question can be answered why the first-tier cities are alr

1.In accordance with the Beijing Municipal resources, environmental sustainability, and to be able to take the ideal limit population is 18 million. But now in the Beijing resident population has more than 19 million, and an instant peak population has reached 21 million. (this may be an answer as t

1. defers to Beijing's resources, the environment carrying capacity, can undertake the ideal limit population is 18,000,000.But already surpassed now in Beijing's resident population 19,000,000, the instantaneous population peak has reached 21,000,000.(This question may reply why said a city already

1. in accordance with the Beijing municipal resources, environmental sustainability, able to assume the ideal limit population is 18 million. But now in Beijing municipality's resident population has more than 19 million peak transient population had reached 21 million. (The question to answer why t

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