This thesis is concerned with a particular case of the above problem in which all toll arcs are connected and constitute a path, as occurs on highways.
这个as从句就是传统语法中所谓as引导的非限制性定语从句,as指代all toll arcs are connected and constitute a path这个分句的内容,并在从句中作主语。
如果觉得我的回答对您有用,请随意打赏。你的支持将鼓励我继续创作!