传统上，人工膝关节使用液压的阻尼，其特性是会对较快的旋转施予较大的阻力。
Traditionally, artificial knee-joints use hydraulic damping, which presents more angular resistance to fast rotational motion than to slow motion.
阻尼网的阻力损耗在几乎所有的装置中都是很大的。
The cost of screen drag is appreciable in almost all installations .
分析了动力试桩中，因土阻力和桩身材料阻尼引起的应力波衰减作用对桩身的完整性检测精度的影响。
It also analyses the influence of attenuation of stress wave cased by the soil resistance and the damp of pile shaft material in dynamic pile test on the precision of pile shaft integrity test.
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