Indiana's main source of power production is coal.

印第安纳州的主要能源来自于煤炭。

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Water was the main source of mechanical power, and by the end of the seventeenth century, England alone is thought to have had some 20,000 working mills.

水是机械动力的主要来源，而到了17世纪末，人们认为仅英格兰就有2万个左右的工作磨坊。

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Electricity is then converted from the main power source of the CubeSat, typically batteries or a solar panel, and applied to a tiny structure roughly the size of a postage stamp.

然后来自立方体卫星上的主要能量源，通常是电池或者太阳能板转化来的电能，应用到一个邮票大小的结构中。

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Mr Bush has received praise for being willing to take on discretionary spending, the main source of power for Congress.

ECONOMIST: Holding the line? | The

America's slowdown, though hardly welcome, is one such: Europe's main source of pulling power these days is domestic demand.

ECONOMIST: The euro area's economy

On June 15th, Britain, Sierra Leone's former colonial power and still its main source of foreign aid, agreed to let the former Liberian president, if convicted, serve his prison sentence in the United Kingdom, thereby removing the main obstacle blocking his transfer and trial.

ECONOMIST: Charles Taylor flies to The Hague