In response to a question on pandemic alert phase change, Dr Chan explained that the definition of WHO's influenza preparedness phases was developed against the backdrop of H5N1 avian flu.
在回答有关大流行警戒级别变更的问题时，陈博士解释说，世卫组织流感防备级别的定义是以h5n1禽流感为背景来制定的。
When we moved to phase 5, I asked all countries to activate their pandemic preparedness plans, and most have done so.
在将警戒级别提升到第五级时，我曾请所有国家启动其大流行防范计划，大多数国家这样做了。
When we moved to phase 5, I asked all countries to activate their pandemic preparedness plans, and most have done so.
在将警戒级别提升到第五级时，我曾请所有国家启动其大流行防范计划，大多数国家这样做了。
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