理论分析和实验均表明：该模型不仅复杂度低于三元文法模型，而且对测试文本域的依赖性也优于前者。

The theoretical analysis and experiments all show that the model not only is lower than trigram model in PP (perplexity), but also is superior to trigram model in dependence on test text domain.

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理论上讲，黑人已拥有投票权，然而，南方的白人们想方设法阻挠黑人实践此权利，比如设置一些不可能通过的“文法”测试，并选择性地让一些黑人参加。

In theory, they already had that right, but Southern whites found ways to prevent them from exercising it, such as impossible-to-pass "literacy" tests, selectively applied.

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