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【英语时差8,16】空中舞蹈2

时间:2015-11-07 06:00来源:互联网 提供网友:yajing   字体: [ ]
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 A skydiver’s body is in a delicate balance. Gravity tugs1 her downward with a constant, relentless2 force, while air resistance pushes her upward. The faster she falls, the more air resistance there is, so eventually these two forces cancel out. Then she falls at a constant rate, her terminal velocity3. To link up with other skydivers in mid-air formations, skydivers need to control their terminal velocity very carefully. After all, if you’re falling at a hundred and ten miles per hour, and your friend is falling at a hundred and twenty, there’s no way you can link at all. As it turns out, your terminal velocity is determined4 by exactly two things–your weight, and the amount of surface area you expose to the ground. While a skydiver can’t do anything about her weight mid-fall, she can control how much area she presents downward. Stomach down, with arms and legs spread out in a kind of belly-flop, the average skydiver is likely to fall at around a hundred and ten miles per hour.


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1 tugs 629a65759ea19a2537f981373572d154     
n.猛拉( tug的名词复数 );猛拖;拖船v.用力拉,使劲拉,猛扯( tug的第三人称单数 )
参考例句:
  • The raucous sirens of the tugs came in from the river. 河上传来拖轮发出的沙哑的汽笛声。 来自辞典例句
  • As I near the North Tower, the wind tugs at my role. 当我接近北塔的时候,风牵动着我的平衡杆。 来自辞典例句
2 relentless VBjzv     
adj.残酷的,不留情的,无怜悯心的
参考例句:
  • The traffic noise is relentless.交通车辆的噪音一刻也不停止。
  • Their training has to be relentless.他们的训练必须是无情的。
3 velocity rLYzx     
n.速度,速率
参考例句:
  • Einstein's theory links energy with mass and velocity of light.爱因斯坦的理论把能量同质量和光速联系起来。
  • The velocity of light is about 300000 kilometres per second.光速约为每秒300000公里。
4 determined duszmP     
adj.坚定的;有决心的
参考例句:
  • I have determined on going to Tibet after graduation.我已决定毕业后去西藏。
  • He determined to view the rooms behind the office.他决定查看一下办公室后面的房间。
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