得益於國內衛生條件的總體改善。現在城市家家都有獨立衛生間，人體感染寄生蟲的機會也就少了

來源: 注冊了不能發言於 2017-12-16 21:03:19 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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