But when the evidence is lacking and leads are lost, even police and forensic science can't always solve the crime.

但是，当证据不足，线索中断时，即便是警方和鉴证科学也并不总能解决罪案。

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But for a long time, these are only a kind of feeling impression and qualitative description when meat quality of Tan-sheep were evaluated, and lacking the objective science data to describe them.

但长期以来，人们对滩羊肉质评定只是一种感觉印象和定性的描述，缺乏表征其肉品质的客观科学数据。

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But when the evidence is lacking and leads are lost, even police and forensic science can't always solve the crime.

但是，在证据不足、线索中断的情况下，即便是警方和鉴证科学也并不总能解决罪案。

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