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鼠之成害，非鼠存在之原状，乃人为所致。
Rat harm was not the inevitable outcome of its existence, but man-made.
youdao
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非渐开线展成滚刀工作原理与齿轮滚刀相同。
The involute generative principle and top gear hob is the same.
youdao
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非渐开线展成滚刀工作原理与齿轮滚刀相同。
The involute generative principle and top gear hob is the same.
youdao