Edison had a peculiar genius for carrying existing discoveries to the point where they could be converted into practicable devices, and it would be no service to his memory, or to the cause of science which he serves so splendidly, to pretend that he invented by performing solitary miracles.

performing solitary miracles，我记得曹老师曾讲过：动名词是动词，可以有宾语，被副词修饰。副词修饰。但这里 为什么是solitary形容词？