The app detects orientation rotation, and provides you with either a single page or two-page layout accordingly.

这个应用程序检测到了方向旋转，就相应地提供给你单页或是两页的内容。

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And in the iPhone 4, a new gyroscope allows for additional motion-sensing capabilities, too, like the ability to track orientation, velocity and rotation.

iPhone 4的陀螺仪则支持更多动作感知功能，比如跟踪方向、速度和旋转等。

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When checked, orientation change is animated. This only applies when Default orientation is set to Auto Rotation.

当勾选，改变方向将带有动画效果。这仅适用于默认方向设置为自动旋转时。

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