美国科学60秒 SSS 2013-06-13
时间：2019-01-20 作者：英语课 分类：Scientific American(六)月
Cheetahs 1 reign 2 as the fastest land mammals capable of sprinting 3 at speeds reaching about 65 miles an hour. But when hunting in the wild, the big cats rarely reach top speed. Instead they rely on rapid acceleration 4 and agility 5 to catch their prey 6. That's according to a study in the journal Nature. Most previous research examined cheetahs running in a straight line or in a controlled habitat. To find out how the big cats move in the wild, researchers put tracking collars on five wild cheetahs in Boxwana. Each collar used GPS and other technology to measure each cat's position, velocity 7 and acceleration. The collars recorded and uploaded data from 367 hunting runs in a 17-month-period. On these runs, the cheetahs on average topped out at only about half their maximum speed. The slower pace allowed the cats to quickly decelerate and re-accelerate into fast, tight turns, the better to avoid getting faked out by prey. So next time your kitty chases a laser pointer, tell her that maneuverability, not speed, is the key to the kill.
- Unlike lions or cheetahs, leopards are secretive, solitary cats. 花豹不像狮子或印度豹，是属于较神秘而隐居的大猫。 来自互联网
- Among this lot are cheetahs, lions, leopards, rhinoceroses, spotted hyenas and elephants. 印度豹、狮子、花豹、犀牛、斑点土狼、大象等，都是此地的居民。 来自互联网
- The reign of Queen Elizabeth lapped over into the seventeenth century.伊丽莎白王朝延至17世纪。
- The reign of Zhu Yuanzhang lasted about 31 years.朱元璋统治了大约三十一年。
- Stride length and frequency are the most important elements of sprinting. 步长和步频是短跑最重要的因素。 来自互联网
- Xiaoming won the gold medal for sprinting in the school sports meeting. 小明在学校运动会上夺得了短跑金牌。 来自互联网
- All spacemen must be able to bear acceleration.所有太空人都应能承受加速度。
- He has also called for an acceleration of political reforms.他同时呼吁加快政治改革的步伐。
- The boy came upstairs with agility.那男孩敏捷地走上楼来。
- His intellect and mental agility have never been in doubt.他的才智和机敏从未受到怀疑。
- Stronger animals prey on weaker ones.弱肉强食。
- The lion was hunting for its prey.狮子在寻找猎物。