The net energy is the sum of the repulsive and the attractive.

净能量是排斥能，和引力能的总和。

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That means the sum of potential energy and kinetic energy.

总功指的是势能,和动能的总和。

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But we could also sum over energy levels.

实际上我们可以对能级求和。

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The total energy of the system, which we are going to get from postulate number four, which says the energy of the electron, which is the energy of the system, is the sum of the kinetic and the potential energy.

这个系统的总能量，也就是我们将从第四个假设中算出的能量，也就是电子运动产生的能量，也就是整个系统的能量，是动能和位能的总和。

麻省理工公开课 - 固态化学导论课程节选

The net energy is the sum of the repulsive and the attractive.

净能量是排斥能,和引力能的总和。

麻省理工公开课 - 固态化学导论课程节选

The sum of path number 2 and path number 3 get me to the same place, so the energy change by going through this time path, this intermediate point here back all the way to final state should be the same the red path.

而经过路径2和3可以3,到达同样的末态，因此经过路径,2和3带来的能量的变化，与路径1带来的,能量变化相同。

麻省理工公开课 - 热力学与动力学课程节选

The Keystone XL pipeline would have single-handedly carried more energy to the United States than the sum of all the green energy projects funded by the Obama Administration.

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Ofgem said energy firms needed to spend that sum over the next 10 years to "keep the lights on" and meet the government's green energy targets.

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In sum, they look and give off a vibe of energy.

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