人类文明经历了从口说文化到文字文化再到当代媒介文化的变迁。

The human civilization has come from oral culture to charactery culture, and then the media culture.

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第二，从文化传承的方式上看，黑非洲文化属口传文化，鲜有文字文化。

Secondly, as far as the mode of communication and inheritance is concerned, traditional Black African culture is basically oral.

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非洲大陆由于长期存在的非文字文化的影响，习惯法的生成途径大多离不开口耳相传。

African continent has been influenced by the culture of no written language for a long time, so the ways of customary law coming into being mostly depend on passing from mouth to mouth.

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