be (a) ˈwitness to sth1(formal)to see sth take place目击，看见（某事发生）He has been witness to a terrible murder.他目击了一起残忍的凶杀事件。2to show that sth is true; to provide evidence for sth证明…真实；为…提供证据His good health is a witness to the success of the treatment.他身体健康证明这种疗法是成功的。 |