... hole shrinkage 井眼缩径 screw fastening piece 螺纹紧固件 magenta coupler 品红成色剂 ...
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screw fastening piece
螺丝紧固件
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Attached is the photo showing the cover piece which is fastening onto the head band by yellow glue which is much better than reverse the screw fastening in mass production.
附件是封面示图。 我们会在页眉处涂上黄色胶把封面粘住，这比批量生产中采取的“反旋螺钉”固定法要好得多。
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