pericardium
发表于 2025-4-1 02:54:35
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代替
发表于 2025-4-1 07:44:29
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antedate
发表于 2025-4-1 13:17:11
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商业上
发表于 2025-4-1 16:50:24
N. E. Naftchi,A. T. Viau,E. W. Lowmaned by starting with a string consisting of one particular “start symbol” and successively rewriting the string according to a finite set of rewriting rules or “productions”. Grammars of interest here impose a structure, called a “derivation tree”, on the string generated. Formally, grammars are defined as follows.
玉米
发表于 2025-4-1 21:59:41
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