- redundant number
- 多余: unnecessary; more than what ...
- 數: frequently; repeatedly
- 多余數字: redundant digit
- 縱向多余數位檢驗: longitudinal redundancy check; longitudinalredundancychecklrc
- 余數: remainder; complement of a number: 9減4, 余數為5。 take 4 from 9 and the remainder is 5
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