Several commercial products are available that offer external keyboards and even projection of virtual keyboards onto any flat surface.
现在有几个商业产品提供了外置键盘，甚至是虚拟键盘投影仪，可以投射到任意平坦的界面上。
External keyboards. A keyboard that slopes away from you provides the best Angle for your hands and wrists.
外接键盘。如果键盘能朝远离你的方向倾斜一个角度，你的手、腕就可以处于最佳角度。
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