词典释义：
双语例句
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As long as WPV transmission has not been interrupted everywhere, all polio-free countries and areas remain at risk of reimportation, particularly from the countries where polio remains endemic.
只要WPV传播不是在每一个地方都被打断(特别是在一些小儿麻痹流行国)，所有的无小儿麻痹症国家和地区仍有再感染的风险。