但从第二到第三阶段的过渡是同样重要的，不应该被忽略。
But the transition from the second to the third is equally important, and should not be forgotten.
莽草酸水平的提高，从第一阶段到第三阶段，然后有所下降。
Shikimic acid level increased from stage one to stage three, then decreased slightly.
到今年底，人类的H5N1病毒能力还不足以散播，警示层级只到第三阶段，距离真正的全球大流行（第六阶段）还差两步。
The self-limiting outbreaks of human H5N1 influenza seen so far bumped the alert level up to phase three, two steps removed from outright pandemic (phase six).
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