它们有一个，一个总动量。
总动量为，两者的矢量和，也就是这个东西。
The net momentum is the vectorial sum of these two, which is this.
这是系统总动量。
那么总的，总动量是多少呢。,使它的大小为负一？
So what is the total... the total momentum... let's give it a magnitude equals minus 1?
单个粒子的动量,会发生改变，但是总动量不变,而动能被损耗。
The momentum of the individual particles gets changed, but the net momentum did not change but the kinetic energy was destroyed.
这是质量总和,乘以总动量，因为我得到这些动量,单个粒子的动量。
Now, this is also 1 over m total times the total momentum, because I've all these momenta of these individual particles.
当收起双臂时，分布空间减少，于是其速度一定会加快以弥补差异，从而保持总动量不变。
When she draws her arms inwards, that distribution is reduced, so her speed must pick up to counteract this difference and keep her total momentum constant.
物理学一条基本定律认为动量守恒，也就是说，除非外力进入系统，否则总动量一定保持不变。
A fundamental law of physics holds that momentum is always conserved, meaning that unless some outside force enters a system, its total momentum must stay constant.
因此，总的角动量,有两个向量。
Therefore there is a total angular momentum which is the vectorial sum of the two.
以变速驱动压力机的工作负荷、运动特点、工作总功、力矩和角动量为基础，计算其驱动电动机所需的功率。
And then the power of servo motor is calculated according to crank press working load, kinematical characteristic, torque and rotational momentum.
公差是零件允许的变动量或给定尺寸允许的总变动。
Tolerance is the amount of variation permitted in the part or the total variation allowed in a given dimension.
对于易于丈量的劳动数目，可直接得到实际完工劳动量占总劳动量的比例。
For easily measured quantities the actual proportion of completed work amounts can be measured.
结论：COPD病人腿部活动和总的日常活动量密切相关，并且比正常对照组减少。
Conclusions: Total daily activity in patients with COPD is closely related to leg activity which is reduced compared with controls of similar age.
为此，把每一等级的小时工资，以生产这种产品所消耗的该等级劳动量占总劳动量的比重为权数，进引加权。
To do this, we weight the hourly wage for each grade by its proportion of the total labor required to produce the product.
结果表明，在冬季，包络地形方案对低纬地区的温度场和风场的预报略有改进，对总涡旋动量通量的模拟也较好。
Results show that the introduction of this scheme improves predictions of zonal temperature and wind fields in tropical troposphere, and simulates better the total eddy angular momentum flux.
底线是你需要减少总的热量摄取，同时还要增加运动量。
The bottom line is you need to reduce your overall calorie intake and partner this with an increase in activity.
底线是你需要减少总的热量摄取，同时还要增加运动量。
The bottom line is you need to reduce your overall calorie intake and partner this with an increase in activity.
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