势能

When an object freely falls , gravitational potential energy is converted into kinetic energy.

当物体自由下落时，势能转化为动能

In 1973, Edward Tryon proposed that the Universe may be a large scale quantum mechanical vacuum fluctuation where positive mass-energy is balanced by negative gravitational potential energy.

在1973年，Edward Tryon 提出一个假设，宇宙可以是一大尺度的量子力学的真空涨落，这里正的质能是由负的引力势能所平衡。

2Particle numeral density distributing law of the system not only bear on and average speed and seat gravitational potential energy of system,but also bear on grads of temperature and speed about distance of system,at one time,it bears on whole spore speed of system.

本文详细的分析了地球大气系统粒子的数密度的分布规律，从中发现：(1)该系统的平衡条件有别于一般热力学系统的平衡条件；(2)该系统粒子数密度分布规律不仅与系统粒子的平均速度和所在处的重力势能有关，而且还与系统的温度和速度的距离梯度有关，也与系统的整体运动速度有关。

A new energy-saving hydraulic pumping unit was designed, which had compound Cylinder-accumulator system, it can use the gravitational potential energy of the pumping unit.

研究出一种节能型液压抽油机，该液压抽油机采用复合缸--蓄能器液压系统，可以回收利用下行程时抽油杆释放出来的重力势能，具有显著的节能效果。

Active Galactic Nuclei is a modern astrophysics research Heat Gate issue, in spite of 40 years of observation and theoretical study But how the gravitational potential energy of the radiation into the mysteries answered.

帮忙将下面这一段话翻释为英文，辛苦了，翻译得好最后有悬赏活动星系核是近代天体物理学研究的热门课题，尽管经过40多年的观测和理论研究，但引力势能如何转化为辐射能这一迷团尚未解开。

When used, water loses properties such as purity, heat content, and potential gravitational energy, but eventually, most degraded water resources are refreshed by natural processes in the hydrological cycle, which is mostly driven by solar energy.

用过之后，水就丧失了其纯净度、热含量以及潜在的势能等属性，但通过由太阳能驱动的水循环这一自然过程，这些属性大都可以恢复。

For the angle from physics:" Fall wooden " because got,the " below " is gravitational action, and this kind of motion of the " below " is it is with the ground consult of content,"Billow of endless the Yangtse River comes " is announcing of a kind of energy change a relationship, namely the kinetic energy of the " of billow of " of translate into of gravitational potential energy of water.

从物理学的角度来说："落木"之所以"下"是由于受到了重力的功能，而且"下"的这种运动是以地面为参照物的，"不尽长江滚滚来"则揭示着一种能量的转化关系，即水的重力势能转化为"滚滚"的动能。

It contains Euler equations for conservation of mass, momentum and energy, and Poisson equation through which the gravitational potential is determined by the density distribution of the gas itself.

它包括由质量守恒方程、动量守恒方程和能量守恒方程构成的Euler方程组以及由星体本身的密度分布决定的自引力势能所满足的Poisson方程。

In the paper whether or not the graviton is the candidate of the dark matter and dark energy is discussed by calculating interactional potential energy of graviton.

本文就通过计算引力子之间的相互作用势能来探讨引力子是否可以作为宇宙暗物质暗能量的候选者。

Therefore it is necessary to research the mechanism of greensand used for high compacted molding methods thoroughly.This subject is one section of the National Natural Science Foundation subject ""Ivestigation on Predicting Method and Mechanism of Springback for High Compacted Sand Molds"", followed of the other completed one named ""Research on Microdeformation of Molding Sand"". A serious of experiments has been done on the reequipped three axial machine under certain technological conditions, and the mechanics, material science, rheologic science. It is systematically studied that the influences on the springback of sand mold were caused by the main influence factors: pressure, compacted rate and the content of soil. Through the analyzed experiments' data, the experienced stress-strain relationship concerning the main influence factors were obtained;under different technical parameter, the springback and spingback's potential energy are compared, the differences and indifferences between them are found out, and the springback's mechanism is discussed;according to the tests' data of YangGuoping coming from Tinghua University, experienced formula of molding sand's springback displacement is induced, the displacement and springback are compared, the margin of error's reasons are analyzed, and they are tested and verified mutually.

本课题为国家自然科学基金项目"高紧实度砂型预测方法及回弹机理的探讨"的一部分，是已结题的国家自然科学基金项目"铸造型砂微变形的研究"的后继，运用力学、材料学及流变学理论，利用改装的三轴仪，在一定的工艺条件下，作了大量系列实验，系统的研究了压实比压、紧实率和膨润土含量对砂型回弹的影响；对实验数据进行了分析和处理，得出了型砂关于压实比压、紧实率和膨润土含量的本构关系的经验公式；把各工艺参数下的型砂产生的回弹量与回弹势能进行比较，找出两者存在的异同点，并对回弹机理进行了探讨；通过清华大学杨国平的实验数据，推导出型砂回弹位移场的经验公式，并与实验测出的回弹量进行比较，分析误差造成的原因，并互相进行了验证。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷