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。
Total energy must be conserved.
总能量必须是守恒的。
系统有一个总能量。
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。
And so this is the total energy, and this is now a constant.
所以这是总功，这是不变的。
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%。
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。
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。
About 56 percent of total energy use comes from traditional biomass-mostly firewood.
根据该手册，全部能源利用的大约56%来自传统的生物原料—大多数是木柴。
Industry consumes about 32 percent of total energy, and that share is projected to grow.
工业大约耗费全部能源的32%，这个比例预计还会扩大。
Of course, if I make the total energy positive, it's not an ellipse, so then it's all over.
当然，如果我让总能量,为正，这就不是椭圆了，所以，都可以迎刃而解了。
So the kinetic energy has increased; the potential energy is the same, so the total energy is up.
所以动能增加，势能不变，所以总能量增加。
So even in the high temperature limit, we don't have them, there's not a maximum total energy.
以在高温极限下，我们没有他们，没有最大温度。
Personally I think we could reach the target of having renewables provide 20% of total energy consumption.
而我个人认为，我们可以达到(可再生能源占)总能源消耗20%的目标。
For ten years, spending on this program increased annually, and annual total energy consumption declined.
在开始的十年，在这项措施上的支出每年都在增加，而每年的总用电量下降了。
In Britain, nuclear power stations provide 19% of our electricity and account for 3.5% of our total energy use.
在英国，核电站提供了19%的电力，占总能源使用的3.5%。
According to the report, in Sub-Saharan Africa, 56 percent of total energy use comes from traditional biomass.
报告称，在南撒哈拉非洲地区，传统生物能利用量占能源总利用量的56%。
In other words, the same proportion of the total energy will be lost for a power-hungry plasma TV as for a tiny PDA.
换句话说，不管是高能耗的等离子电视机，还是小小的PDA，传输所损失的能量占总能量的比例是相同的。
More than 6% of Colorado's total energy output is from alternative resources, the eighth best rating in the country.
超过科罗拉多州超过百分之六的能源输出来自替代能源，此项排名第八。
Converting only 2.5 percent of that radiation into electricity would match the nation's total energy consumption in 2006.
只要将这些辐射中的百分制二点五转化成电能就可以满足一个国家在2006年的全部的能源消耗。
Depending on a plant's design, the new membranes could reduce total energy consumption by as much as 20%, reckons Dr Hoek.
根据工厂的设计，这种新型薄膜可以把总耗能降低20%，Hoek博士估算。
I mean we can, we can sort of understand why OK, the total energy, if we measure it, we measure a process which is not reversible.
例如我们易于理解为什么，当试图测量一个不可逆系统的总能量，给出的或许。
So far, renewables account for a small share of its energy supply, although the overall target is a 15% share of total energy by 2020.
尽管到2020年的目标是可再生能源能源占总能源的15%，但是到目前为止，可再生能源只占很小的一部分。
US studies have found the total energy required for bottled water production was as much as 2, 000 times the energy cost of producing tap water.
美国的研究发现，制造瓶装水所需要的总能源是制造相同量自来水的2000倍。
And so what's going to happen — I'm going to get an elliptical orbit like so, whereby 2a must be larger than 2r because my total energy is larger.
这就是将要发生的-，我将要进入一个椭圆形轨道，在这里，2a肯定要，比2R大，因为总能量增大了。
And so what's going to happen — I'm going to get an elliptical orbit like so, whereby 2a must be larger than 2r because my total energy is larger.
这就是将要发生的-，我将要进入一个椭圆形轨道，在这里，2a肯定要，比2R大，因为总能量增大了。
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