應該這樣理解，加拿大的白血病發病率比其他國家高，同樣中國的肝癌發病率肯定不是第一位，而是比其他國家高

來源: betadine 於 2014-09-14 07:39:52 [舊帖] [給我悄悄話] 本文已被閱讀：次

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