1. (法庭上的)证词
    In a court of law, someone's testimony is a formal statement that they make about what they saw someone do or what they know of a situation, after having promised to tell the truth.

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    e.g. His testimony was an important element of the Prosecution case...
           他的证词是这宗公诉案件中的一个重要因素。
    e.g. Prosecutors may try to determine if Robb gave false testimony when he appeared before the grand jury.
           检方可能要努力查证罗布在大陪审团面前是否作了伪证。

2. 证明;证据
    If you say that one thing is testimony to another, you mean that it shows clearly that the second thing has a particular quality.

    e.g. This book is testimony to a very individual kind of courage.
           这本书显示了个人非凡的勇气。
    e.g. Her living room is also her office, filled with desks, books, papers, a testimony to her dedication to her work.
           她的客厅也是她的办公室，里面摆满了书桌、书籍和文件，充分证明了她的敬业精神。