context-free phrase structure rule 语境自由词组律 context-free rewriting rule 语境自由改写律 context-free structure 语境自由结构；不受语境限制的语言结构 ..
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... 至关重要的可视度 vital visibility 上下文无关重写规则 context-free rewriting rule 灌溉对农业至关重要 irrigation was vital to agriculture ...
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