抑郁症出现在青春期，一个人经历巨大改变的阶段。

Depression can occur during adolescence, a time of great personal change.

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因为农民退休了，美国农业将会经历巨大改变。

As these farmers retire, American agriculture will experience big changes.

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因为农民退休了，美国农业将会经历巨大改变。

As these farmers retire, American agriculture will experience big changes.

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