最后，这些结果并不表明需要改变预警阶段级别。
Finally, these findings do not indicate a need for a change in phase level.
世卫组织在1999年采用了大流行预警的分阶段方法。
The phased approach to pandemic alert was introduced by WHO in 1999.
这份预警机工程和制造初始合同开发阶段包括设计、开发、集成和飞行管理系统单元测试。
The initial contract for the engineering and manufacturing development phase includes design, development, integration and testing of the Flight Management System Suite (FMSS) for the AWACS aircraft.
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