- residual item
- 余数: remainder; complement of a n ...
- 邮件: mail; post; postal matter
- 余数: remainder; complement of a number: 9减4, 余数为5。 take 4 from 9 and the remainder is 5
- 邮件: mail; post; postal matter 挂号邮件 registered post; 航空邮件 air mail; 小包邮件 a postal packet
- 残余数: modulo
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