世卫组织区域要获得无脊髓灰质炎认证，必须满足三个条件。
Before a WHO region can be certified polio-free, three conditions must be satisfied.
只有在同时满足下列所有条件时才可以进行等值或差额货物调换。概无列外。
ALL LISTED CONDITIONS MUST BE MET IN ORDER TO RECEIVE EQUAL OR lesser.
只有在同时满足下列所有条件时才可以进行等值或差额货物调换。概无列外。
ALL LISTED CONDITIONS MUST BE MET IN ORDER TO RECEIVE EQUAL OR lesser.
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