Interchangeable PARTS: use an interchangeable part for the internal region of the spring side.
互换部分：在弹簧内部区域使用互换零件。
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To make the part interchangeable, each individual part must be made to a size that will fit the mating part in the correct way.
为了使零件能够互换，每个零件作出的大小必须能准确地适用于与其匹配的零件。
For the most part, they had been reduced to interchangeable parts.
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