You can tilt the iPad any direction, even upside down, and the screen will flip to display an upright image.
你可以任意旋转iPad，甚至上下倒置，屏幕会随即调整显示正确朝上的图片。
Light entering the eye forms an upside-down image on the retina. The retina transforms the light into nerve signals for the brain.
光线进入眼睛，在视网膜上形成了一副倒立的画面，视网膜将光线译成神经信号，脑子识别信号并将画面倒立回来，于是我们就知道我们看到的是什么画面了。
In the physical body the eye views objects upside down. It sends the image of what it observes to the brain which interprets the image and makes it appear right side-up to us.
在身体里眼睛看东西是倒过来的。眼睛传送所观察到的图像到大脑里并转换图像，而且使它看起来是正向对我们。
Below the equatorial region, the brownish upside-down shark fin in the left-hand image disappears in the photo at right.
在赤道区域下面，左图中呈褐色上下翻飞的鱼翅在右图中消失了。
Below the equatorial region, the brownish upside-down shark fin in the left-hand image disappears in the photo at right.
在赤道区域下面，左图中呈褐色上下翻飞的鱼翅在右图中消失了。
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