When people graduate from college, it's time for them to fly the nest.

人们大学毕业后就到了自立门户的时候。

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Arctic terns, being true long-distance migrants, they nest in coastal wetlands of northern Europe but fly south for thousands of miles to spend the European winters in Antarctica.

北极燕鸥是真正的长途迁徙者，它们在北欧沿海湿地筑巢，但会向南飞行数千英里，在南极洲度过欧洲的冬季。

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At the time their son and daughter are like the swallows go out from their nest and fly far apart from each other, the autumn of life also dyed mother 'sr hair to be grey.

岂不知儿女们长大一天，她们就接近了秋日一天，待儿女们像燕子出巢，飞向天南地北的时日，秋色也就染白了她们的发鬓。

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Some of this is pragmatic: high rents and tight mortgage-lending criteria make it expensive and difficult to fly the nest.

ECONOMIST: Young adults have become reluctant to fly the family nest