The basic rule for this checksum is that each of the first nine digits is multiplied by its position (that is, the first digit times one, the second digit times two, and so on).
这个校验和的基本规则是前九位数的每一位乘上它的位置(即第一位数乘上1，第二位数乘上2，依次类推)。
Many times two or more of these processes have to be used in combination to obtain the desired separation.
很多时候，两个或多个这些程序必须结合起来使用以获得所需的分离。
Many times two or more of these processes have to be used in combination to obtain the desired separation.
很多时候，两个或多个这些程序必须结合起来使用以获得所需的分离。
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