testimony
noun [ C or U ] formal uk/ˈtes.tɪ.mən.i/ us/ˈtes.tə.moʊ.ni/
（尤指法庭上的）证词，证言
(an example of) spoken or written statements that something is true, especially those given in a law court
Some doubts have been expressed about his testimony. 有人对他的证词提出了一些质疑。
be (a) testimony to something 清楚地证明
to be clear proof of something
The reports are testimony to the many hours of research completed by this committee. 这些报告充分表明该委员会花了很多时间进行研究。