I.Introduction1.1 Definition of an error An error happens when the interpreter’s delivery affects the communicative impact of the speaker’s message,including semantic inaccuracies and inaccuracies of presentation.Along with the development of simultaneous interpreting,there has been a number of professional interpreters and linguists present their definitions and points of views about the errors I. Introduction 1.1 Definition of an error An error happens when the interpreter’s delivery affects the communicative impact of the speaker’s message, including semantic inaccuracies and inaccuracies of presentation. Along with the development of simultaneous interpreting, there has been been a number of professional interpreters and linguists present their definitions and points of views about the errors