You can get your AA, certification, and even pursue a doctoral degree without having to step foot into a classroom.

您可以让您的机管局，认证，甚至追求博士学位而不必一步步行到一间教室。

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And the variations of AA were related to the changes of microbial population in some degree.

AA的变化与微生物类群的变化有一定的关联。

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And the variations of AA were related to the changes of microbial population in some degree.

AA的变化与微生物类群的变化有一定的关联。

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