This is a very general and somewhat vague expression that means a greater number of hosts have been found to be ill than one would expect to find during a period of time within a certain population.
这是一个很普遍甚至有些模糊的表述，流行病指在某个特定人群中，有数量较大的宿主在一段时期发病。
It should be noted that this time around the former Women's World 9-ball and 10-ball champion is not currently ill, but is taking proactive, preventive action.
这段时间内，这位前女子九号球、十号球世界冠军并没有生病，只是事先采取了预防措施。
It should be noted that this time around the former Women's World 9-ball and 10-ball champion is not currently ill, but is taking proactive, preventive action.
这段时间内，这位前女子九号球、十号球世界冠军并没有生病，只是事先采取了预防措施。
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