方向为x正轴方向，在碰撞前，它有一定动量。
Let this be the direction of increasing x, and so before the collision I have a certain amount of momentum.
本文根据动量平衡和动量守恒定律的基本原理，提出了两种推算碰撞前汽车动量或碰撞速度的图解方法。
Based on momentum balance and the law of momentum conservation, two new graphic methods are developed to determine the pre-impact vehicle momentum or collision speed in this paper.
半个世纪前，大多数人每天的活动量相当于步行三至五英里，而如今，普通人一周的活动量还不到这个水平。
Fifty years ago, most People's Daily levels of activity were equivalent to walking three to five miles a day; today, the average person fails to cover that distance in a week.
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