C2 something that is added to something else in order to improve it or complete it; something extra补充物,增补物
a part of a magazine or newspaper, either produced separately or as part of the magazine or newspaper(杂志或报纸的)增刊,副刊
an extra part of a book, either produced separately or included at the end of the book, containing information that was not available when the book was first published(书的)附录,补编,补遗
C2 to add something to something to make it larger or better增加,补充,增补
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