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1·The defence doubted that she-or any journalist-could be a reliable witness.

辩护律师疑责米勒或其他任何记者作为见证人的可信度。

2·The witness is unbiased and so reliable.

那个证人没有偏见，因而是可靠的。《新英汉大辞典》

3·The witness is unbiased and so reliable!

那个证人没有偏见，所以是可靠的。

4·Recognizing the witness correctly, can greatly enhance the reliable coefficient of the evidence and guarantee the persuasive power and the confidence level of his evidence from the main body .

正确地认定证人，就会大大提高证据的可靠系数，从主体上保证这一证据形式的说服力与可信度。