修订了对大流行级别的分组和描述，使之更容易得到理解、更精确，并建立在可观察现象的基础上。
The grouping and description of pandemic phases have been revised to make them easier to understand, more precise, and based upon observable phenomena.
修订了对大流行级别的分组和描述，使之更容易得到理解、更精确，并建立在可观察现象的基础上。
The grouping and description of pandemic phases have been revised to make them easier to understand, more precise, and based upon observable phenomena.
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