This pattern is characterized by (1) its non-typicality in syntactic structure, (2) Homogeneity in form but diversity in structure, and (3) middle position between syntax and lexicon.

• 第二，是同形异构结构；第三，是句法与词法的中间站。这三个特点决定了定叫，“V双+N双”作为一种短语类型的特殊地位，同时也决定了对定中“V双+N双”作专门研究的价值。