所以斑竹说追求健康的好处是为了让晚年健康一点而不是长寿
所有跟贴·加跟贴·新语丝读书论坛
送交者: HunHunSheng 于 2007-10-29, 17:51:25:
回答: 这老年人要是病了也真是个事情 由 HunHunSheng 于 2007-10-29, 17:37:04:
in geometric terms if two endpoints are fixed, try to
to make the line connecting them as upward as possible
(concave?)
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