哭泣作为一种情感的表达是人类独有的，这在人类进化和人类文化的发展中发挥了重要的作用。

Crying as an expression of feeling is unique to humans and has played an essential role in human evolution and the development of human cultures.

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但哭泣作为一种情感的表达是人类独有的，这在人类进化和人类文化的发展中发挥了重要的作用。

But crying as an expression of feeling is unique to humans and has played an essential role in human evolution and the development of human cultures.

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在影响外语学习成败的诸多因素中，学习动机作为一种情感因素早已引起人们的普遍关注。

Motivation, which is one of the main influential factors of foreign language achievement, has drawn more and more attention of English teachers and researchers.

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