vi.

1. 作证[（+for/against/to）]
   The next witness will testify for the defense.

   下一个证人将为被告人作证。

2. 表明，证明[（+to）]
   The excellence of Shakespeare's plays testifies to his genius.

   莎士比亚戏剧的卓越证明了他的天才。

3. 向上帝忏悔
   Reformed sinners testify.

   受感化的罪人向上帝忏悔。

vt.

1. 证实[+that]
   The witness testified that he had seen the man shoot at his victim.

   证人作证说他看到那男人向其受害者开枪。

2. 表明，证明[+that]
   Her deep sighs testified her sadness.

   她的一声声长叹表明她的悲伤。

3. 声明
   He testified his faith in Christianity openly.

   他公开声明信仰基督教。

v.

1. give evidence as a witness in a law court.
2. serve as evidence or proof of something.