A model of the implantable bioartificial kidney shows the two-stage system.

置入式生物人工肾模型二级系统示意图。

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Compared with the one-stage system, the two-stage system has the better performance in whole. Energy savings and the capability to use low temperature heat are obtained.

较单级系统而言，双级空调系统具有良好的整体性能与节能效益，在使用低温热源上有较大优势。

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Even the advanced two-stage focusing system has made its way from the T4i, which utilizes both phase-difference and contrast AF in order to achieve focus more efficiently when capturing video.

ENGADGET: Canon EOS M mirrorless camera hands-on (video) Hands-on

Such systems include all phases of the Phased Adaptive Approach to missile defenses in Europe, the modernization of the Ground-based Midcourse Defense system, and the continued development of the two-stage Ground-Based Interceptor as a technological and strategic hedge.

CENTERFORSECURITYPOLICY: Center for Security Policy | Mapping a National Security Failure: Ratification of the New START Treaty | Page: 14

The minister then announced a two-stage study of the teacher training infrastructure, to consider the affordability of the current system and the options for a more shared and integrated system.

BBC: Northern Ireland Assembly