eyewitness
noun [ C ] uk/ˈaɪˌwɪt.nəs/ us/ˈaɪˌwɪt.nəs/
目击者；见证人
a person who saw something happen, for example, a crime or an accident
According to an eyewitness account, the thieves abandoned their vehicle near the scene of the robbery. 据一位目击证人的描述，这伙盗贼在抢劫现场附近弃车而逃。