back contamination
... 反方位 back bearing 返航感染 back contamination 背航道 back course ...
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其他国家的反应不一。比利时给流感病人购置了一批口罩，而西班牙则在从感染区返航的飞机上给乘客发送口罩。
Others, such as Belgium, have bought some for flu patients, while several, including Spain, have handed them out to passengers on planes returning from affected areas.
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