The friction term is assumed to be proportional to the flow velocity with a phase difference.
粘性假设正比于流体速度，相位存在差异。
On the load increased, but not sensitive to changes in friction coefficient, so heavy, the friction coefficient is extremely small, and the same long-term accuracy can have long-term mechanical life.
对负荷增大，但磨擦系数无敏感变化，因此重负荷下，磨擦系数极小，并且长期保持精度不变，可得机械使用寿命长期保持。
Craftsmanship is unique, the work is colorful, achieved true color effect, waterproof wash resistant, friction, long-term preservation.
制作工艺独特，作品色彩鲜艳，实现了真正的彩照效果，防水洗、耐磨擦，可长期保存。
If the flood wave is deformed on its way of propagation, there exists acceleration term or inertia force that equals to internal friction.
波体在传播途中变形，则有加速项或惯性力，内摩阻力等于惯性力。
It is easy to harden or damage in the long-term high-temperature environment and friction of minerals, so it should be changed regularly.
在长期高温环境及矿物的磨擦作用下，易变硬或破损，应定期更换。
Ceramics has good biocompatibility, low friction coefficient, and wear-resistance, but lined ceramics breakage affects long-term effect of ceramics to ceramics artificial hip joint.
陶瓷材料具有良好的生物相容性、摩擦系数低，磨损小，耐磨力强，但陶瓷内衬断裂影响了陶瓷对陶瓷人工髋关节的长期效果。
Ceramics has good biocompatibility, low friction coefficient, and wear-resistance, but lined ceramics breakage affects long-term effect of ceramics to ceramics artificial hip joint.
陶瓷材料具有良好的生物相容性、摩擦系数低，磨损小，耐磨力强，但陶瓷内衬断裂影响了陶瓷对陶瓷人工髋关节的长期效果。
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