本文评述了古DNA进行PCR分析的有关方法、存在的问题及实验结果的一些甄别标准。
What here introduced is analysis of ancient DNA by PCR, including the method, problems, resolutions and criteria of experimental result authenticity.
与此相似，如果我们听说自我表现是艺术的一个充分条件，那就立刻促使我们问：这个标准是否真的能够单把艺术甄别出来。
Similarly, if we hear that self-expression_r is a sufficient condition of art, that prompts us to ask whether or not that criterion really picks out only artworks.
目标取向教育评价根据其不合理的价值标准甄别学生，并对其分等，造成“后进生”的出现。
According to the irrational value standard, target-oriented educational evaluation separates students, and makes some students underachievers.
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