The incorporated, or subordinate clause is normally called an embedded clause, and the clause into which it is embedded is called a matrix clause.

被并入或是从属的子句通常被称为子句，而包含子句的子句被称为主句。

I will provide a uniform explanation for OSC in this dissertation: V2 (with its null subject and null object) is essentially a purpose clause modifying the matrix clause.

本文为动词同宾结构提供了一个统一的解释：这些句子中的V_2（连同其空主语和空宾语）本质上是目的性状语从句。

Research on its acquisition difficulty mainly focuses on two aspects: relative clause type and matrix position.

而对它的习得难度研究主要集中在两个层面，即从句类型和从句位置。