Many researchers fault case-control work as being a weak method for showing direct causality, especially because it is subject to substantial recall bias.

很多研究员都指责案例对照法不是展现因果关系直接有力的方法，尤其因为它受制于大量的记忆误差。

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Combined with natural gas test work, the quality control method in natural gas chemical laboratory was discussed.

结合天然气检测工作实际情况，对天然气检测实验室质量控制方式进行了探讨。

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Parsons recommended a method of automatic machine control that would guide a milling cutter to produce a "thru-axis curve" in order to generate smooth profiles on work pieces.

为了在工件上加工光滑的轮廓，帕森提出了一种自动的机床控制方式，它能够引导铣床刀具加工出一种“过轴曲线”。

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