Machining Tolerance is the permissible variation in actual space width or actual tooth thickness.

加工公差是花键的实际齿槽宽和实际齿厚的允许的变动量。

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And if you don't put a point but just put a number, this specifies the width of space that will be used by the number you're inserting there.

如果你不用点而只用数字，这个指定的长度是由,你插入的数字决定的。

哈佛公开课 - 计算机科学课程节选

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