The basic principle of the DEM is based on Newton's Second Law of Mot - ion. The whole problem is solved by using the dynamic relaxation method and the time-marching tech...

离散单元法的基本原理是牛顿第二定律，结合不同的本构关系，用动力松弛法按时步进行迭代求解。

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But a problem has arisen over a decision to include American marching bands in the opening ceremony on September 15th 2000.

ECONOMIST: Australia