回答如下: 本句中的介词over的意思是“关于,有关”,相当于介词about / on / concerning 。下面简述一下这四个词( about,over, on, concerning)的用法及区别: 1. about (关于)较为常用,使用频率很高,不如on / concerning 那么正式。它通常指泛泛地或非正式地谈论普通的事情。例如: We would like to talk about your family with you. 2. over (关于) 仅用在有争执或担忧的情景中。例如: They both sides will negotiate over the border conflict. We are greatly concerned over / about their safety. They often quarrel over / about some trifles. 3. concerning (关于) 较为正式,并且其前必须是名词,不能是动词。例如: He will give us a lecture concerning the global environment protection. They had a quarrel over / about / concerning the ownership of the land. (误) They talked concerning the present situation. (正) They had a discussion concerning the present situation. (正) They talked about the present situation. 4. on (关于)通常用于学术性、科技、法律等方面比较严肃的话题。例如: This is a book on physics. His essay on birds will appear in a magzine.