In contrast, patients with severe sepsis and preexisting AF did not have an increased risk of in-hospital ischemic stroke compared with those with severe sepsis and no AF.

相反，与没有房颤的脓毒血症患者相比原先有房颤的患者并没有增加院内缺血性中风风险。

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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.

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The F900EXR automatically switches between Phase Detection AF and Contrast Detection AF depending on the subject and scene, guaranteeing superb ease-of-use and fast, accurate autofocus no matter what the setting or shooting conditions.

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When in Live View or recording video, contrast detect AF quickly acquires, and can even track focus through the frame.

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