此种体制无法长久。
许多密码体制都可归于此种模型，该模型对设计序列发生器有借鉴意义。
Several known sequence generators are of this model. The model can be useful in designing sequence generators.
而在WTO体制中，此种模式被限制、淡化或转化，悄然改变为“履行义务的非互惠模式”。
This model, however, has been limited, dimmed or even transformed under WTO and changed to "the model of non reciprocity on implementing obligations".
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