It is the end of the engineering phase and the start of the flight testing phase.
现在是工程制造阶段的结束，飞行测试阶段的开始。
It is on track to be introduced in summer of 2012, and is still in the engineering phase, not early production. We suspect that poor battery life doomed the prior prototype version.
iPhone5将于2012年夏天发布，目前仍处于工程设计阶段，新机尚未产出，放弃此前原型机设计可能是因为电池续航时间不甚理想。
It is on track to be introduced in summer of 2012, and is still in the engineering phase, not early production. We suspect that poor battery life doomed the prior prototype version.
iPhone5将于2012年夏天发布，目前仍处于工程设计阶段，新机尚未产出，放弃此前原型机设计可能是因为电池续航时间不甚理想。
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