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。
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。
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