As yet, there isn't a firm answer.
Are Vladimir's fourth-wall breaks irritating or enlightening?。业内人士推荐PDF资料作为进阶阅读
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Cesar Cadenas/ZDNETThe ThinkPad's keyboard, for example, is widely regarded as being exceptionally functional, as are the physical left and right buttons above the trackpad, the red TrackPoint for precision pointing, and extensive port options. Instead of experimental LED lighting and zero-lattice keyboards, the ThinkPad sticks to what works.