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2013-05-23 12:21
求翻译：How old is "old"? The answer has changed over the years. Two hundred years ago, you were old at 35. That was the average life expectancy then. At the turn of the 19th century, as medical knowledge advanced, the average life expectancy increased to 45. In 1950, 70-yearolds were really old. Today, a healthy 70-year-old i是什么意思？ 待解决
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How old is "old"? The answer has changed over the years. Two hundred years ago, you were old at 35. That was the average life expectancy then. At the turn of the 19th century, as medical knowledge advanced, the average life expectancy increased to 45. In 1950, 70-yearolds were really old. Today, a healthy 70-year-old i
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