Man ____ the leading role in the application of the electron

Man ____ the leading role in the application of the electron what is the role and the extensive application of the intern 英语翻译本人理解的比较困难.Tenaris has had the leading role in this trans the leading professional organization of developers in the w the role of commercial the role of women the role of the role of supplier How fast of the speed of the electron which in an atom? 危险好男人 THE LEADING MAN怎么样 fed was always speaking highly of her role in the play ,____ She was always speaking highly of her role in the play,____,