Another ring for the difference between the base-level, allowing the ferrule at the base of the non-standard technology of surface markers.
为区别另一套圈的基准面，允许在该套圈的的非基准面上标工艺标志。
Another ring for the difference between the base-level, allowing the ferrule at the base of the non-standard technology of surface markers.
为区别另一套圈的基准面，允许在该套圈的的非基准面上标工艺标志。
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