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许多年前，研究者普遍相信大脑里可能藏着一个像“内部秒表”的结构，专门负责计时。随着越来越多的实验，这种观点正在被悄悄改写——大脑也许并没有一只“钟”，我们感受到的时间，很可能是靠动作、感觉和注意力一起“拼”出来的。
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What emerges from this design is something resembling a tiny virtual machine built on top of TeX’s macro expansion engine. The \count registers serve as RAM (with dedicated address ranges for the board (200-263), scratch computation (188-194), and the search call stack (10000+)). The \csname lookup tables act as a read-only ROM for precomputed data (file/rank mappings, piece-square tables, material values). Token lists (\movelist, \legalmovelist) serve as dynamically allocated buffers. Macros like \makemove/\unmakemove and \pushstate/\popstate are the instruction set. TeX’s \ifnum and \loop primitives provide the control flow. The whole thing is a register machine with no stack frames, no heap, and no garbage collector (just flat integer registers and name-based indirection). pdflatex is, in effect, the CPU executing this VM.。wps对此有专业解读