看来采用自由无阻尼正规模态可保证变形运动的线动量和角动量为零。
The use of the free undamped normal modes is seen to ensure that the linear and angular momenta of the distortional motion vanish.
在很多国家，城市规模都遵循一个显著的正规模式，即所谓的位序-规模法则。
In many countries, city sizes follow a remarkably regular pattern, known as the rank-size rule.
首先简单介绍了经典的BDI模型，以及基于正规模态逻辑存在的一些问题。
At first the classical BDI model is introduced simply, and points out some problem based on normal logical model.
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