In order to investigate the origin of the oscillation of friction force on the atomic scale, Molecular dynamics simulation is employed to research it from the period of the oscillation.
为了研究原子尺度下摩擦力波动现象产生的本质，利用分子动力学模拟的方法从摩擦力波动周期的角度对其进行探讨。
Conclusion in order to remove the disease which has infective force in latent period, it is necessary to control the patients not only in the infected period but also in the latent period.
结论潜伏期有传染的疾病，不但要注意控制染病期的病人，还要注意控制潜伏期的病人。
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