Most ergonomic keyboards fall into two categories: fully split which separates the board into two pieces, and unibody split, also known as an Alice design, which angles the keys outward at the bottom. When the keys are rotated outward or split into two halves, it allows for a wider spread between your elbows for a more relaxed typing position. Other ergonomic features, such as thumb clusters, center tenting and negative tilting are sometimes added to either type of board.
观察大国经济，不仅要看量，更要看质。
。新收录的资料对此有专业解读
maintainability improvements like convenient portable cartridges for storing，详情可参考新收录的资料
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