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1·If I make the total energy positive, it's not an ellipse.

如果我让总能量为正，它就不是一个椭圆了。

2·Total energy must be conserved.

总能量必须是守恒的。

3·They have a total energy.

系统有一个总能量。

4·What is the total energy of the Earth around the sun?

地球绕太阳，所做的总功是多少呢？

5·If the total energy is positive, the orbit is not bound.

如果总能量为正，轨道就不规则了。

6·And so this is the total energy, and this is now a constant.

所以这是总功，这是不变的。

7·Let this represent the total energy of the incident electron.

让这个来表示入射电子的，总能量。

8·Renewables will only make up 15 percent of total energy by 2020.

可再生能源在2020年只能达到总需求的15%。

9·Coal currently provides about 28% of the world's total energy use.

现在全世界能源消耗总量的28%由燃煤提供。

10·I'm going to write down the conservation of total energy, mechanical energy.

我要写下整体的，能量守恒，机械能。