- redundant number
- 多余: unnecessary; more than what ...
- 数: frequently; repeatedly
- 多余数字: redundant digit
- 纵向多余数位检验: longitudinal redundancy check; longitudinalredundancychecklrc
- 余数: remainder; complement of a number: 9减4, 余数为5。 take 4 from 9 and the remainder is 5
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