谢谢。学习了。黑人不但乙状结肠比较长，而且饮食结构也比其他族群差。

来源: 御用文人于 2015-09-19 21:33:26 [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.