摩擦速度是湍流切应力与空气密度比值的平方根，具有速度量纲，常用U*表示。
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When the diameter was increased, the threshold friction velocity there is first an ascending then a decline trend.
临界摩擦速度U_(*t)随着粒径的增加呈先增大后减小趋势。
参考来源 - 半干旱区气溶胶散射、吸收特性及起沙通量的初步研究·2,447,543篇论文数据，部分数据来源于NoteExpress
这种摩擦往往会减慢风的速度，使它们吹散污染物的效率大大降低。
This friction tends to slow the speed of winds, making them far less efficient at dispersing pollutants.
航天飞机重返地球大气层时因有摩擦力而减慢速度。
The force of friction slows the spacecraft down as it re-enters the earth's atmosphere.
物体运动，并向上加速度，因为摩擦力方向斜上，值为这个。
It is moving, so sure, it's going to be accelerated so the frictional force is in this direction, has this value.
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