Some tablets (the 7" size is a great example) can still be used in this manner by placing the tablet in the portraitposition.
7寸大小的一些平板仍然可以使用这样的方式来打字。
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Tip: Position a portrait subject near a large, bright window that does not receive direct sunlight. It makes for a no-cost softbox— no studio equipment necessary.
But take another look at the hardware: the Apple on the back, and the position of the home button both tell us that the iPad is meant to be used in portrait mode, at least most of the time.