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
可划
为3，即末
、倒数第二、倒数第三，末又可为2个阶。
段(
)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.
黄河源区可划为3，即末、倒数第二、倒数第三，末又可为2个阶。
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