Bicycling is un-natural to humans. Anything un-natural may hurt us.


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送交者: Enlighten 于 2005-10-04, 15:17:13:

回答: 这以后骑自行车得抬着身子骑 由 xj 于 2005-10-04, 15:06:38:

because we are not evolved to handle that.


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