1·Even an expert witness called to discuss statistical movements of stock prices turned feisty as he sparred with prosecutors seeking to discredit his analysis and testimony.
有一位被召来讨论股价变动的专家证人，由于其分析和证词遭到检察官的怀疑，与之发生了激烈争吵。
2·It is unprecedented for prosecutors to discredit their own star witness.
检察官怀疑自己的主要证人，这是史无前例的。
3·There was good reason to discredit the witness.
有充分理由不相信那位证人。
4·The counsel for the prosecution has set out to discredit the defence witness.
在被原告方律师的询问过程中证人感到的困惑不解。