1. U 活力，干劲，能力　 the quality of being full of life and action; power and ability to do a lot of work or be physically active
2. P 精力　 the power which one can use in working
3. U 能，能量，能源　 the power which can do work, such as drive machines or provide

　produce ～　产生能量
　provide ～ for　为…提供能量
　reduce ～　减少能量
　store up ～　贮存能量
　use the ～　利用能量
　devote one's ～ to　致力于
　direct one's ～ to　致力于
　have much ～　精力充沛
　pour ～ into　把精力倾注于
　work with ～　努力工作
　youthful ～　年轻人的活力
　heat ～　热能
　light ～　光能
　solar ～　太阳能
　sound ～　声能
　～ sources　能词/cn>

介词+～

　a burst of ～　一股劲
　quantity of ～　能量
　sources of ～　能词/cn>

　The manager listened carefully to Edison's plan and admired him for his energy and enthusiasm.　经理仔细听取了爱迪生的计划，称赞他有干劲，有热情。
　She is blessed with immense talent and boundless energy.　她才智非凡，精力无限。
　He didn't know how to blow off his superfluous energy.　他不知如何发泄过剩的精力。
　Since you are going to fight a hard battle, now you should conserve your strength and store up your energy.　你们将要打一场硬仗，因此现在必须养精蓄锐。
　They invested time and energy in the election campaign.　他们把时间和精力投入选举活动。
　He was always overflowing with energy.　他精神总是很饱满。
　The lads' energy pleased him but their recklessness worried him.　小伙子们的劲头使他高兴，他们的冒失又使他担心。
　They poured their energies into religious reform.　他们致力于宗教改革。
　It was found necessary to retire several generals who lacked energy and enterprise.　使几位缺乏精力和上进心的将军解职是必要的。
　She flung all her energy〔energies〕 into her work.　她把全部精力都投到工作上。
　Plants absorb energy from the sun.　植物吸收太阳的能量。
　The energy released by the chain reaction is transformed into heat.　连锁反应释放出来的能被转换成热。
　We'll bend to translating a book on atomic energy.　我们将专心翻译一本有关原子能的书。
　The fuel shortage awoke the country to the need for developing atomic energy.　燃料匮乏使这个国家认识到开发原子能的必要性。
　Einstein's theory links energy with mass and velocity of light.　爱因斯坦的理论把能量同质量和光速联系起来。
　Scientists realized that it was possible to obtain energy by splitting the atom.　科学家们认识到通过原子裂变有可能获得能量。
　New machines were introduced into the factory. As a result, not only were time and energy saved but production was greatly increased.　工厂引进了新的机器，因而不仅节省了时间和能源，还极大地提高了生产量。
　World energy demand is increasing at a rate of about 3% per year.　世界能源的需求量正以每年百分之三的速度递增。
　I didn't have the energy to disagree with her.　我没有能力不同意她。

 ♣ energy, force, might, power, strength, vigour
　这组词的共同意思是“能”“能量”“精力”。其区别在于：
1. energy在物理学定义中为“能”“能量”，用于生理学上指“精力”。
2. power系一般用语，可指动力、思维能力等各种力量或能力。例如：
　A car needs a lot of power to go fast.　汽车高速行驶需要很大动力。
　Every normal, healthy person has power to think.　每一个正常、健康的人都有思维能力。
3. strength指某人或某物所具有的内在力量，可指体力、力气或抽象的力量。例如：
　He hasn't got enough strength to get out of bed.　他没有足够的力气下床。
　At last his strength gave out.　他的体力终于不支了。
　He has strength of character.　他性格坚强。
　Union is strength.　团结就是力量。
4. force指的是物质或精神力量，多指为做成某事而使用的力量，也常指武力。例如：
　We had to use force to get into the house.　我们不得不强行进屋。
　Some of them forced their way into our office.　他们中有些人强行进入我们的办公室。
　His arguments forced them to admit he was right.　他的论据迫使他们承认他是对的。
　The thief forced her to hand over the money.　贼强迫她把钱交出来。
5. might指“力量”“威力”“强权”“权势”等，既可指人体的力量，也可指政治、军事等的强大而产生的威力，其程度要比其他几个词强。例如：
　The army fought bravely, but it was crushed by the might of its powerful enemy.　军队勇敢地战斗，但最终还是被敌人强大的势力所摧垮。
　They would have little chance to survive against our might.　在我们的强大力量面前，他们几乎无法继续生存下去。
　The work was so difficult that it was beyond my might.　这项工作太难了，它超出了我的能力。
　The competition is strong and we must study with all our might.　竞争是强有力的，我们须尽全力地学习。
6. vigour指生命产生的力量，常译为“活力”。例如：
　He is full of vigour.　他充满了活力。

　［同义词］ activity, efficiency, fire, force, power, spirit, stamina, strength, vim, zest, zip
　［反义词］ inertia, lethargy, weakness
　［词源］　希腊语engergētikos（内在活力的）