The middle class is a buffer layer in the structure of social interests.

中间阶层是社会利益结构中的缓冲层。

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When the buffer is empty, the transport layer is responsible for refilling it.

当缓冲空了，传送层负责再装满它。

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When the buffer is empty, the transport layer is responsible for refilling it.

当缓冲空了，传送层负责再装满它。

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