(减速度)：当用户不再触摸到触摸板时游玩区从减速到完全停止的速度。
Deceleration: the speed in which the play area slows down to a complete stop when the user is no longer touching the touchpad.
提出采用可控减速法设计离心风机两元叶片，即通过三维黏性流场计算，采用正交试验设计方法，以确定流道内平均速度的减速规律和叶片型线。
In the present method, the orthogonal design and the three-dimensional viscous flow field computation were used to determine the optimum controlled deceleration flow in impellers and the blade curves.
对汽车在刹车减速过程中刹车力与减速度的关系以及车轮的制动模型作了初步研究，建立了动力学模型。
The relationship of brake-force and deceleration and the brake model of wheels are studied, and dynamics model is made.
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