1.It provided a cheap source of calories and was easy to cultivate, so it liberated workers from the land.
但它是价廉的热量来源，也很容易栽种，因此使人脱离了田地间的劳作。
2."Hopefully down the line there could be a cost savings and presumably a cheap source of energy, " Miller said.
“希望接下去能有一个成本节约的廉价的能源来源，”米勒说
3.Geothermal energy, as it is called, is a cheap source of energy.
人们称之为地热能。它是一种廉价能源。
4.The yen carry trade has not been the only cheap source of liquidity in recent years.
日元套利交易并非近年来唯一的廉价流动性来源。
5.In the United States, McDonald's may be a cheap source of calories and comfort food.
在美国，麦当劳也许是热量和方便食品的廉价来源。
6.Coal is indeed a cheap source of energy, but its extraction is extremely costly to the environment.
煤炭其实是一种成本低廉的能源，但对它的采挖却耗资巨大。
7.Furthermore, it is questionable whether ultimately unclear power is a cheap source of energy.
进一步说，核能最终是否是一种廉价的能源还不确定
8.Illegality feeds "a massive underground economy that exploits a cheap source of labor, " Mr.
他还说，这种“非法性质剥削利用廉价劳动力，养活了一大批地下经济体。”
9.Pasture, both temporary and permanent, is a relatively cheap source of nutrients.
无论轮作草场，还是永久草场，都是比较廉价的营养资源。
10.A cheap source of antimatter would change everything.
如果能找到一种便宜的反物质来源这一切都将被改变。