scrap side是相对于keeper side而言, 应该是指被切掉的部分, 参考下面的例句:
Assuming the cut line is marked correctly, you need to know which is the scrap side and which is the keeper side. The rule is to place all of the width of the blade on the scrap side of the cut line. That way the 1/8th of an inch of sawdust you remove will not be sawn from the keeper side, which would make it too short.
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