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来源:雅诚德英语网
The fact that infected people can shed virus before symptoms appear adds to the risk of international spread via asymptomatic air travellers.
被感染者在症状出现之前已开始传播病毒,这就加剧了通过无症状航空旅客造成国际传播的危险。
The fact that infected people can shed virus before symptoms appear adds to the risk of international spread via asymptomatic air travellers.
被感染者在症状出现之前已开始传播病毒,这就加剧了通过无症状航空旅客造成国际传播的危险。