我们变老时，不也会期盼同样的安全感吗？

Wouldn't we all expect the same sense of security when we grow old?

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夕阳西下时，天空的颜色千变万化。

At sunset the sky became a kaleidoscope of colors.

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人们可以看到狗的皮肤颜色稍微变黄，但对于肉眼而言，荧光在没有紫外光照射和未使用护目镜时不会被看到。

One can witness a slightly yellower change in the color of the dog's skin, but to the naked eye, fluorescence cannot be seen without the presence of UV light and goggles.

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These conditions permitted a development of institutions and habits needed for freedom, even as they also made Europe vulnerable to conquests and to extinction, and Europe was almost extinguished practically before there was a Europe; very early in its history.

这些恰恰是自由的形成和发展,需要的的制度和特征,尽管这也使欧洲,在外敌入侵时变的不堪一击,实际上,在它早期的历史中,欧洲在尚未形成前就差点消失

耶鲁公开课 - 古希腊历史简介课程节选