n. 附件；增加固定资产；附加物（addition的复数）
n a component that is added to something to improve it
n the act of adding one thing to another
n a quantity that is added
n something added to what you already have
n a suburban area laid out in streets and lots for a future residential area
n the arithmetic operation of summing; calculating the sum of two or more numbers
- 原型: addition
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