He may have been to some of those places.那些地方他也许去过一些。Those who have been to Dalian all say it's beautiful.凡是去过大连的人都说大连很美.I have been to see John.我去看过约翰了....
地球的磁层既具有保护的功能，却又极其危险。The earth's magnetosphere is at once protective and dangerous.在磁层顶合成3D磁结构的聚类观测.Cluster observations of complex 3 D magnetic structures at the magnetopause.本文解出了三维磁层顶的Chapman-Ferraro模型.Chapman - ...
The kind advices are often unpleasant to the ear.好言常常不入耳.Your good advices were still ringing in my ear long after you said them.你的忠告久久地回响在我的耳边.Advices from abroad indicate that war is about to begin.来自国外的消息表明战争即将开始....