目前世卫组织的大流行预警级别仍然为第三阶段：人类感染新亚型病毒，但是这些感染中的绝大多数是直接从动物那里获得的。
The present WHO level of pandemic alert remains at phase 3: human infections with a new virus subtype are occurring, but the vast majority of these infections are acquired directly from animals.
在第三阶段——实时交谈，我们为电子企业增加了人员的交互，以为顾客提供响应更及时、更个人化的联系方式。
In stage three, live chat, we extend the e-business with human interaction to give it more responsive, personal contact with its customers.
铁质储量为零时，你会觉得虚弱，疲乏无力，喘不过气，这是缺铁第三阶段的典型症状。
Iron reserves gone to zero, you feel weak, tried and out of breath, which is the typical symptom of the third stage of iron deficiency.
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