求翻译：For elderly people,exchange students “keep up young——they really do,” said Jean Foster,who is hosting 16-year-old Nina Porst from Denmark.是什么意思？

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悬赏分：1 - 离问题结束还有

For elderly people,exchange students “keep up young——they really do,” said Jean Foster,who is hosting 16-year-old Nina Porst from Denmark.

问题补充：

匿名	2013-05-23 12:21:38

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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