That–trace Constraint/Filter/Phenomenon

that-语迹制约/过滤/现象

A term in generative grammar, originally in extended standard theory, used in connection with such constructions as Who do you know that – saw Bill?, which involve extraction of a subject from a clause introduced by a complementizer.

生成语法术语，最初用于扩展的标准理论，与Who do you know that – saw Bill?“你知道谁看见比尔？”这类构式有关，涉及将一主语从一个由标补语引出的小句中提取出来。