动量被认为是“守恒的”，也就是说，动量一旦被建立，就一定会转移到其他地方。
Momentum is said to be "conserved", that is, once you build it up, it has to go somewhere.
能量在其任何形式都是守恒的。
我们要再一次假定，动量是守恒的。
仅仅利用机械能概念，它是守恒的。
We only used the concept of mechanical energy, which is conserved.
系统作为一个整体，动量是守恒的。
It's just the system as a whole for which the momentum is then conserved.
我们仍将看到违反CP守恒的现象。
总能量必须是守恒的。
你看，这正是，验证动量守恒的方法。
So, you see, that's exactly how you can demonstrate the conservation of momentum.
动能是守恒的。
也就在反应期间,我有个合理假设，动量是守恒的。
It's just during the impact I claim that to a reasonable approximation, momentum will have to be conserved.
因此，我们不能把语句“能量是守恒的”做为一个绝对的陈述。
As a consequence, we cannot turn the statement "energy is conserved" into an absolute statement.
如果违反能量守恒的持续时间不太长，那么自然界并不反对这种违反。
Nature has no objection to a violation of energy conservation, provided (that) the violation does not last too long.
必须记住，动量守恒甚至对于非弹性碰撞也是成立的，尽管这时动能已不守恒。
It is important to realize that momentum conservation applies even to inelastic collisions, in which the kinetic energy is not conserved.
这一原理，也即能量守恒，是物理学中最宝贵的定律之一。
This principle, called conservation of energy, is one of our most cherished laws of physics.
下一阶段，具体运算阶段，七到十二岁，儿童可以解决守恒问题，但儿童的抽象推理能力仍然有限。
The next phase, concrete operations, from seven to twelve, you can solve the conservation problem, but still you're limited to the extent you're capable of abstract reasoning.
力学系统的对称性与精确不变量（守恒量）在力学、物理学中具有非常重要的意义。
The studies on symmetries and exact invariants (conserved quantities) play a very important role in mechanics and physics.
动量守恒原理则不管内力的性质如何（保守的或非保守的）都能适用。
The principle of conservation of momentum holds whatever the nature of the internal forces, conservative or not.
能量守恒这一概念是热力学的第一定律。
The idea that energy is conserved is the first law of thermodynamics.
（德国数学家）Noether所发现的是，只要在自然界呈现连续对称性（的地方），守恒定律就一定成立，反之亦然。
What Noether discovered is that whenever nature displays a continuous symmetry, a conservation law comes along for the ride, and vice versa.
它讲的是能量的守恒。
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.
能量守恒是科学家已发现的关于宇宙的最基本的规律。
Conservation of energy may be the most basic rule that scientists have yet discovered concerning the universe.
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.
译：能量守恒和能量转换定律，不仅是工程实践的主要基础，而且也是物理、天文以及化学等方面推理的主要基础。
The law of conservation and transformation of energy is the chief basis of physical, astronomical and chemical reasoning as well as engineering practice.
物质运动在量上的守恒和在质上的转化是自然界的一条基本法则。
The conservation and transformation of movement are a basic law in nature.
杨振宁和李政道因为在弱相互作用下宇称不守恒原理方面的工作获得了1957年的诺贝尔物理学奖。
Yang received the 1957 Nobel Prize in Physics together with Tsung-dao Lee, for their work on parity non-conservation of weak interaction.
杨振宁及其同事李政道因在弱相互作用中宇称不守恒方面的工作获得了1957年的诺贝尔物理学奖，成为第一个获得诺贝尔奖的华人。
Yang and his colleague Li Zhengdao received the 1957 Nobel Prize in Physics for their work on parity nonconservation of weak interaction, becoming the first Chinese to win a Nobel Prize.
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.
文章论述与实例相结合，灵活运用质量守恒定律，解答具有一定难度的初中化学习题。
Combining discussion with true examples, this essay solves certain chemical exercises of Junior Middle School through the law of mass conservation flexibly.
文章论述与实例相结合，灵活运用质量守恒定律，解答具有一定难度的初中化学习题。
Combining discussion with true examples, this essay solves certain chemical exercises of Junior Middle School through the law of mass conservation flexibly.
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