World Health Organization 世界卫生组织
Nations prepare as World Health Organization raises the alert level.
国内为世卫组织提升警报级别做好准备。
The World Health Organization says most of these infections happen during childhood.
世卫组织表示，大部分乙肝感染都发生在儿童时期。
The World Health Organization says most of these infections happen during childhood.
世卫组织表示，大部分乙肝感染都发生在儿童时期。
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