radix-digit 基数数字
MOST commonly, a digit that arises when the sum or product of two or more digits equals or exceeds the radix of the number representation system.
最常用的是指当两个或多个数的和或积等于或大于记数系统的基数时出现的进位数。
These algorithms are aimed at reducing the number of repeated iterative operations. The use of radix 4 leads to 2-digit results for each iterative operations.
基本出发点是减少运算的重复迭代次数，采用每次运算能得到二位结果的算法而不是常规的每次只能得到一位结果的二进制算法。
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