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.
双语例句
例： His testimony was an important element of the prosecution's case.
他的证词是本起公诉案中的一个重要因素。
例： Prosecutors may try to determine if Robb gave false testimony when he appeared before the grand jury.
检察官可能会试图确定罗伯是否在大陪审团面前做了伪证。