系概念第四册23课句子语法问题
原句:itcomesnearertotheengineswithwhichmanhasconqueredtheair,asheboasts.
我百度后有人说可以还原成itcomesnearertotheenginewhichasmanboastshasconqueredtheairwiththeengine.
请问这是什么语法?==新概念第四册里好多这种句子根本不能理解:))