【英语时差8,16】风力农场的科学原理

 As interest increases in alternative energy, wind power has emerged¹ as one of the best alternatives to fossil² fuels. Which is why wind farms are popping up throughout the United States and around the world. But you can’t just set up a wind farm anywhere and expect it to produce enough power. Why? Because some places are windier than others. Wind happens because when sunlight hits the earth, it warms some spots more than others, creating warmer and cooler areas that fluctuate³ throughout the year. Because warm air weighs less than cold air, it rises, leaving in its wake an area of low air pressure. Then cooler, higher pressure air whooshes⁴ in to replace the warm air. And that’s what we call wind.

1 emerged   

vi. 浮现, (由某种状态)脱出, (事实)显现出来

参考例句：

• They emerged from the church into the bright daylight. 他们走出教堂来到明亮的日光下。
• The swimmer emerged from the lake. 游泳者从湖水中浮出来。

2 fossil   

n.化石，食古不化的人，老顽固

参考例句：

• At this distance of time it is difficult to date the fossil.时间隔得这么久了，很难确定这化石的年代。
• The man is a fossil.那人是个老顽固。

3 fluctuate   

vi.波动，起伏，动摇；vt.使波动，使起伏

参考例句：

• Prices fluctuate from year to year.物价年年波动。
• Body temperature can fluctuate if you are ill.人患病后体温可能会上下波动。

4 whooshes   

n.飞快的移动( whoosh的名词复数 )v.（使）飞快移动( whoosh的第三人称单数 )

参考例句：

• Cool air whooshes up through the grates on the street. 冷空气吹得大街上的格栅呜呜作响。 来自柯林斯例句