交叉作为依赖长度的副作用
Crossings as a side effect of dependency lengths
摘要：
句子的句法结构呈现出一种惊人的规律性：依存关系画在句子上方时往往不交叉。我们调查了两种相互竞争的解释。传统的假设是，这种趋势源于一个独立的语法原则，减少交叉几乎为零。这个观点的另一种假设是交叉是依赖长度的副作用，即具有较短依赖长度的句子应该倾向于具有较少的交叉。我们能够拒绝在大多数语言考虑的传统观点。备择假设可以导致一个更简约的语言理论。
英文摘要：
The syntactic structure of sentences exhibits a striking regularity: dependencies tend to not cross when drawn above the sentence. We investigate two competing explanations. The traditional hypothesis is that this trend arises from an independent principle of syntax that reduces crossings practically to zero. An alternative to this view is the hypothesis that crossings are a side effect of dependency lengths, i.e. sentences with shorter dependency lengths should tend to have fewer crossings. We are able to reject the traditional view in the majority of languages considered. The alternative hypothesis can lead to a more parsimonious theory of language.
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