C programmers have talked about this class of error since the late '70s, but their impact remains large in 2007.
自从70年代末期以来，c程序员就一直讨论此类错误，但其影响在2007年仍然很大。
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Prior to a major system error, the impact of the risk of an unintentional user error would be ranked low because of the user's excellent records of entering accurate data.