The last glacial period is divided into two stadial stages with an interstadial stage.Evolution of lakes of the source area during the Quaternary went through three stages.
黄河源区的
期可划分为3期，即
期、
二期、三期，期又可分为2个阶。
退阶段期的The last glacial period is divided into two stadial stages with an interstadial stage.Evolution of lakes of the source area during the Quaternary went through three stages.
黄河源区的期可划分为3期，即期、二期、三期，期又可分为2个阶。
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