... serrated camshaft 凸轮花键盘; 凸轮花键轴 serrated change 锯齿形改变 serrated die 使成锯齿形 ...
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serrated change
锯齿状的变化
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The basic design--a long piece of metal, with a serrated blade, attached to a handle--didn't change much for several millennia.
FORBES: No. 10 The Saw
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