另一方面，它不仅具有纪念功能、实用功能，同时也表现出了严格的社会等级制度，是儒家礼制文化的一个表征符号。

On the other hand, not only has the practical function of the door, mark the features, but also showed a strict rating system and become a culture of Confucian ceremony symbolic representation.

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一旦语言从2岁左右开始发展，他们就有了一个符号表征系统，可以谈论过去和现在环境之外的事情。

Once language starts to develop from about age 2, they do have a system for symbolic representation and can talk about things which aren't in their immediate environment including the past.

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在上世纪六十年代以前，语言的符号表征一直被视为是人类的专利。

Until the 1960s, symbolic representation of language was thought to be uniquely human.

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