deviation [ˌdi:viˈeɪʃn]

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n.背离，偏离；偏差，偏向；离题

a variation that deviates from the standard or norm;

Deviation from this rule are very rare. 很少有违反这条规则的。
Any deviation from the party's faith is seen as betrayal. 任何对党的信仰的偏离被视作背叛。