讲解By correlating markings made in various parts of the world,historians have been able to r前半句 ing做什么成分?
问题描述：
讲解By correlating markings made in various parts of the world,historians have been able to r
前半句 ing做什么成分?
答
前半句不是个完整的句子啊,by 引导的状语提前了,原句的意思是--“通过比较在世界各地做的标记（marking）,历史学家终于能够.”“markings made in various parts of the world”做correlate的宾语,marking是做名词,m...