这组人员更常见的辩解是，科研工作是如此的困难——取样大，分析难——以至于大多数成果最终得出的结论是错误的。

The group's more general argument is that scientific research is so difficult-the sample sizes must be big and the analysis rigorous-that most research may end up being wrong.

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首先介绍了高速切削加工难加工材料的特点，通过对高速切削机理的研究，分析难加工材料高速切削加工的可行性。

Following the introduction of the characteristics and cutting mechanism of high speed machining, we educe the feasibility of the high speed machining difficult-to-machine materials.

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他们的分析本身也有其难圆其说的地方。

The analysis could also be challenged on its own turf.

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