The existence of two or more forms of individuals within the same species .

在一个种类中两个或更多形态个体的存在。

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The earliest written forms of Chinese in existence today date back nearly 4,000 years.

今天所存留下来的最早的汉字已有近四千年的历史。

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The earliest written forms of Chinese in existence today date back nearly 4,000 years.

今天所存留下来的最早的汉字已有近四千年的历史。

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