witnessn.目击者；证人vt.目击；经历；见证；出席；观察vi.证明；为(宗教信仰)做见证witness point见证点witness angle参考角Witness System证人制度witness server见证服务器witnessed will有人作证的遗嘱witness sample核查用试样witness vector实现向量witness marker定位标志witness a crash目击碰撞witness a crime目睹罪行