如果一文法的句子存在两个语法树，那么该句子是二义性的。
A sentence of a grammar is ambiguous if there exists two syntax trees for it.
给定一种语言，定义其语法的表示法以及一个解释器，解释器会使用该表示法解释语言中的句子。
Given a language, define a representation for its grammar along with an interpreter that USES the representation to interpret sentences in the language.
最近由德国两名出版商发起的联盟拟写了一份报告，提议调整版权法，将保护条例从文章扩展到标题﹑句子，甚至是零散的文字。
A recent paper by two publishers’ associations proposed changing copyright law to protect not only articles but also headlines, sentences and even fragments of text.
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