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聪明的木匠会测量两次尺寸，再切削。
The wise carpenter measures twice and cuts once.
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再切削公差和常规重叠率。
Tolerance for remachining and constant overlap.......
多年研究表明，利用现有的切削理论，已经无法再成十倍的提高切削速度。
The research indicates it is impossible that cutting speed is improved decuple in accordance with present cutting theory.
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