addendum

/əˈdɛn.dəm/ 名词 C2

中文：附件

Something to be added; especially text added as an appendix or supplement to a document. · An addendum was added to the contract to clarify payment terms.· The author included an addendum at the end of the book.
A postscript.
The height by which the tooth of a gear projects beyond (outside for external, or inside for internal) the standard pitch circle or pitch line.

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