eyewitness汉语翻译：
n. 目击者, 见证人英语解释：
名词 eyewitness:

a spectator who can describe what happened

动词 eyewitness:

be present at an event and see it with one's own eyes

例句：

An authentic account by an eyewitness.一份目击者的真实证言

详细解释：
eye.wit.ness
n.（名词）
A person who has seen someone or something and can bear witness to the fact.
见证人，目击者：曾看到某人或某事并能对事实充当证人的人