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。

youdao

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。

youdao

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。

youdao

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