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汉语拼音：dìng zé

公认的定理或法则；确定不移的原则。

1. 法规；准则。

   《三国志·魏志·傅嘏传》：“士有恆贵，官有定则。” 唐 许瑶 《题怀素上人草书》诗：“志在新奇无定则，古瘦灕纚半无墨。” 明 沉德符 《野获编·词曲·弦索入曲》：“絃索九宫或用滚絃，或用花和大和釤絃，皆有定则。” 胡也频 《到莫斯科去》十九：“我的生活是没有什么乐趣的，至少在意义上所存在的只是既然活着就活下去吧这一条定则而已。”

• We now have to provide a plausible reason for these rules.

  现在就必须对这些定则作出合理的解释.

• The " unconditional surrender " formula was announced by the President and the Prime Minister.

  总统和首相宣布了 “ 无条件投降 ” 的定则.

• Forbidden transitions are those for which dipole radiative transitions are not allowed by the selection rules.

  禁戒跃迁指的是选择定则所不容许的偶极辐射跃迁.

• So, if there is no set is to be added, is fill numerous complementary.

  所以, 若是毫无定则地加以增补, 是补不胜补的.

• A magnetic field exerts a force on a current - carrying wire according to the familiar right - hand rule.

  根据[手定则]磁场会对通有电流的电线施力.

• The relationship between the aromatic transition state theory and Woodward - Hoffmann generalization are also discussed.

  本文还讨论了芳香过渡态理论和woodward-Hoffmann定则的关系.