While there are countless types of ergonomic keyboards, the most common are typically going to be angled keyboards and split keyboards. Angled keyboards, often referred to as “Alice”-style keyboards in the mechanical keyboard world (named after the TGR Alice), split the alphanumeric keys along the middle, positioning the two halves at an angle from one another while keeping the modifier keys (backspace, enter, shift, and so on) in their standard positions. The angle will vary between keyboards, as will the number of keys, but the main constant in an Alice-style keyboard is that, despite the halves being separated from one another, the keyboard itself is not split. It has one case that all of the keys are held in.
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过去几十年的技术史，一次次印证了这个规律。互联网最初是美国国防部的高级研究计划局项目，为了让科学家们在核战争爆发后还能远程通信。GPS原本是军用卫星系统，1983年才向民用开放。