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.
当处理碰撞问题，物体的速度，在碰撞前无撇号。
When we deal with collisions, the velocities of the objects before the collision are unprimed.
碰撞前没有动能。
原来有一定量的，碰撞前的动能，当然，我们可以计算出来，碰撞前的动能。
Now, there was a certain amount of kinetic energy before the collision, and of course, we can all calculate that kinetic energy before the collision.
典型摩托车碰撞前预知交通危险的典型视线下并未发生人的边缘视野局限。
The typical motorcycle pre-crash lines-of-sight to the traffic hazard portray no contribution of the limits of peripheral vision;
我们可以计算出差别，在储存能量。，与碰撞后动能的差别，还有碰撞前动能。
Now we can calculate what the difference is between the potential energy... the kinetic energy after the collision and the kinetic energy before the collision.
他们实际是用轨迹，残骸的滑行轨迹,来计算出v’,就可以复原现场,和碰撞前一样。
They actually use the... the track, the... the skidding tracks of the wreck to calculate v prime, and then they can try to reconstruct the situation as it was before the collision.
实际上，社区盾比赛看来缺少如众人期待的英伦足坛两巨头碰撞前舆论的硫磺火焰。
Indeed, the Community Shield appears to be lacking the fire and brimstone many expected in the build up to the clash of the two titans of English football.
调查人员发现那名17岁的司机不仅在开车时使用手机，而且就在碰撞前的那一刻正在发送短信。
Investigators found that not only was the 17-year-old driver using her cell phone, but text messages were also being sent just before the crash.
颗粒碰撞前的速度大小将决定颗粒碰撞后是沿声波方向运动还是逆声波方向运动或是停留在原地振动；
The speed of particles before collision will determine whether particles will move along the direction of sound waves, against direction of the sound waves or will vibrate in their original position.
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.
对于二维碰撞，可以根据车辆的碰撞位置和停止位置，反推计算出车辆碰撞后的分离速度和碰撞前的接触速度。
For collinear collision, the preceding collision velocity and post collision velocity are calculated on the basis of the impact locality and stop locality of collision vehicle.
对于一维碰撞，根据碰撞后车辆的滑移距离和车辆的塑性变形量，反推计算出车辆碰撞后的速度和碰撞前的接触速度；
For collinear collision, the preceding collision velocity and post collision velocity are calculated on the basis of the slippage distance and unreturnable distortion of collision vehicle;
上体育课和课外活动前要作好准备活动，运动时要注意不要剧烈碰撞，以免撞伤或摔伤。
On physical education and extra-curricular activities to prepare before the warming-up, attention should be paid to exercise when not to dramatic collision, so as not to be knocked down or fall.
4亿年前，一个火星大小的天体和地球发生了灾难性的碰撞从而产生了月亮。
It was created by a catastrophic collision between our planet and a Mars-size body over 4 billion years ago.
大约5500万年前就开始的非洲大陆及欧洲大陆的相互碰撞形成了阿尔卑斯山。
The formation of the Alps through the collision of the two continents Africa and Europe began about approximately 55 million years ago.
RA108 赛车的设计保证所有关键领域都符合国际汽联的安全规则，并且防撞结构满足碰撞试验的要求，例如：前鼻椎、单壳体车身和尾部防撞结构。
The design of the RA108 ensures that all key areas comply with the FIA safety regulations and crash test requirements for the impact structures, such as the nose, monocoque and rear impact structure.
据Google透露，在行车测试中，仅发生了一个小事故，当时其中一辆试验汽车在交通信号灯前停下时，后面车辆与之发生了追尾碰撞。
According to Google, only one minor accident took place during the testing, when one of the cars received a bump from behind at traffic lights.
从区域构造的观点看，同板块碰撞有关的前陆盆地是油气聚集的有利地区。
From a tectonic point of view, foreland basins related to plate collision are areas favorable for petroleum accumulation.
中部韧性层在南阿尔卑斯和欧洲前陆碰撞过程中，既有垂向挤出，也有侧向挤出。
In the process of south Alps Europe foreland collision, not only the vertical extrusion, but also the lateral extrusion develops.
本文从离子动力学方程出发，利用LB碰撞模型研究了离子-离子碰撞效应对前鞘等离子体输运的影响。
By using ion kinetic equation, the influence of ion-ion collision effects on the presheath plasma transport is taken into account through the LB collisional model.
该蛇绿混杂岩带是义敦碰撞造山带大地构造相中的弧前混杂带相。
The ophiolite melange zone represents forearc melange facies of the Yidun collision orogens.
这些伸展构造很显然是扬子克拉通和华北克拉通在三叠纪碰撞时，大别山造山带前陆位置岩石圈弯曲导致地壳上部产生非弹性变形的结果。
Such structure in the collision foredeep of the Dabieshan Orogen was resulted in inelastic extensional deformation of the conver side of the flexed plate aroused by lithospheric flexure.
这些伸展构造很显然是扬子克拉通和华北克拉通在三叠纪碰撞时，大别山造山带前陆位置岩石圈弯曲导致地壳上部产生非弹性变形的结果。
Such structure in the collision foredeep of the Dabieshan Orogen was resulted in inelastic extensional deformation of the conver side of the flexed plate aroused by lithospheric flexure.
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