例如，无论一个舞者多么想要跳离地板，然后开始旋转，角动量守恒定律绝对阻止这样的动作。
For example, no matter how much a dancer wishes to leap off the floor and then start turning, the law of conservation of angular momentum absolutely prevents such a movement.
是违背守恒定律而凭空消失了吗？
这一透彻的概括就是能量守恒定律。
This sweeping generalization is the law of conservation of energy.
能量守恒定律也获得简单的形式。
这根本就不违反能量守恒定律。
There is also no violation of the law of conservation of energy.
物理学的守恒定律类似于语言学规则。
In physics, conservation laws are analogous to linguistic rules.
动量守恒定律告诉你,碰撞后速度是多少。
So the conservation of momentum tells you what the speed is after the collision.
让我们试着用机械能，守恒定律解答一下。
角动量守恒定律，可以用回转器来演示。
The law of conservation of angular momentum may be demonstrated with a gyroscope.
要服从质量守恒定律。
如果宇称守恒定律受到破坏，就会取消这个限制。
If the law of parity conservation were suspended, this restriction would be removed.
不知怎么的，这一定律和,角动量守恒定律有所相似。
Somehow, it has the smell of some conservation of angular momentum.
我们知道，机械能守恒定律-，动能和，势能的总和。
Then we have the conservation - of mechanical energy — the sum of kinetic energy and potential energy.
守恒定律提供了从实验这个有利地位观察到的图景。
The conservation law provides a perspective from the vantage point of experiment .
然后应用能量守恒定律去求得螺杆泵转子的设计规律。
Then, find out the design rules with the conservation law of energy.
这是我们第一次，在这种系统里使用，角动量守恒定律。
Now we're going to apply for the first time in systems like this, the conservation of angular momentum.
所以你也可以用，功能定理，或者是机械能，守恒定律。
And so you could have used the work-energy theorem or you can use the conservation of mechanical energy.
我有一个证明，有些是违反了能量守恒定律电动现象。
I have a proof that there are electrodynamic phenomena which violate the law of energy conservation.
这本书对于守恒定律的双曲线的体制献身于有限体积法。
This book is devoted to finite volume methods for hyperbolic systems of conservation laws.
我们援引了摩尔分数的道尔顿定律，要服从质量守恒定律。
We invoke Dalton's Law of molar proportions, we write it subject to conservation of mass.
还有一个更重要的事情，这些对称性暗示着大量的守恒定律。
An even more important fact is that these symmetries implicate a large number of conservation laws at the particle level.
势能的改变量，将会转化成动能的改变量，这就是能量守恒定律。
The change in potential energy is going to be the change in kinetic energy You have conservation of energy principles.
这些物理系统的测试依赖于对作用力、质量和能量守恒定律的标准设计实践。
Design and testing of these physical systems rely on standard design practices that employ the laws of conservation of force, mass, and energy.
机器中的各种损耗，尽管很大，但这与能量守恒定律丝毫也不矛盾。
The various losses in a machine great as they are do not in any way contradict the law of conservation of energy.
其结果，其中一些方程非常眼熟，比如动量守恒定律和牛顿第二定律。
Turns out, some of these equations were very familiar: the law of conservation of momentum, and Newton's second law of motion.
物理世界中存在着一些守恒定律，其中有些是严格的，有些是近似的。
In the physical world there exist a number of conservation laws, some exact and some approximate.
由质量守恒定律，质量密度增量来自未挠动的质量密度的散度和位移矢量场。
According to the law of mass conservation the incremental mass density can be inferred from the divergency of the scalar unperturbed mass density and the vectorial displacement field.
所有这些各种各样的损耗，尽管它们数量很大，却一点也不违反能量守恒定律。
All these various losses great as they are do not in any way contradict the law of conservation of energy.
所有这些各种各样的损耗，尽管它们数量很大，却一点也不违反能量守恒定律。
All these various losses great as they are do not in any way contradict the law of conservation of energy.
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