古钱币专有名词，缘是指钱币的最外圈，也叫边，所谓的“窄缘”就是指钱的边比较窄。古代钱币的版式之一，和“阔缘”相对。
通过对标准门槽及窄缝门槽的体型研究，分别拟定了适合各自门槽的闸门底缘型式。
Finally, through the study of structural forms of standard gate slot and narrow slit gate slot, the appropriate gate bottom rim patterns are recommended for each type g.
通过对标准门槽及窄缝门槽的体型研究，分别拟定了适合各自门槽的闸门底缘型式。
Finally, through the study of structural forms of standard gate slot and narrow slit gate slot, the appropriate gate bottom rim patterns are recommended for each type gate slot, respectively.
在下面的两张中国黄缘盒龟图片，注意它们的宽度，左边的母的更宽，右边的公的更窄。
In the pictures below, note the larger tail of the male on the right and the smaller, shorter tail of the female on the left.
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