第二阶段仍然是测试疫苗的安全性，但主要是检测疫苗是否有效。如果第二阶段进展顺利，疫苗研发就可以开始第三阶段。
Phase 2 still tests the vaccine's safety, but it's mainly a test to see if the vaccine seems to work. If Phase 2 goes well, the vaccine can begin Phase 3.
全书每个主题的讨论均跟随着一段叙述，主要来源于集成和系统测试经理的观点。
Throughout the book, each discussion of a topic is followed by a section of narrative, mainly from the integration and system test manager's point of view.
Leap-X的第二阶段的测试主要为压气机。
The second phase of Leap-X testing focused on the compressor. Picture: CFM International
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