详见:
http://www.cdc.gov/nccdphp/sgr/ataglan.htm
(美国人的态度)
A NEW VIEW OF PHYSICAL ACTIVITY
THE BENEFITS OF REGULAR PHYSICAL ACTIVITY
A MAJOR PUBLIC HEALTH CONCERN
WHAT IS A MODERATE AMOUNT OF PHYSICAL ACTIVITY
EXAMPLES OF MODERATE AMOUNTS OF ACTIVITY
……
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本帖最后由 bing2008 于 2008-7-19 08:02 PM 编辑 ]