该证人作了伪证，她提供的证据不可信。
This witness has committed perjury and no reliance can be placed on her evidence.
原告竭力削弱证人的可信性。
The prosecution did its best to undermine the credibility of the witness.
虽然其中一些显然被添油加醋过了，可是其他一些韵事却有可信的证人。
Though some of the tales undoubtedly grew in the telling, others were authenticated by reliable witnesses.
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