每个时代都是由其标志性的挑战界定的。

Every era of history is defined by its signature challenge.

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每个时代不是一个梦想的破灭，就是一个梦想的诞生。

Each age is a dream that is dying or one that is coming to birth.

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关于人口问题，每个时代都有每个时代的恐慌。

EVERY age has its big demographic scares.

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And everybody started to possess at least one language when they were a child.

每个人从儿童时代开始,便至少掌握了一种语言

耶鲁公开课 - 心理学导论课程节选