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。

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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。

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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。

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Over the long term the SARS outbreak will add friction to the cost of doing business in Asia, much as impromptu shoe checks, cargo inspections and travel jitters followed Sept. 11 in the U.S. Hotel business in Asia fell 25% from February to March.

FORBES: Aftershock