【英语时差8,16】空中舞蹈（下）

By bending arms and legs or angling her body–presenting more or less surface area to the ground–she can change her rate of fall, slowing or speeding up her terminal velocity¹ around ten or twenty miles per hour. To fall as fast as two hundred miles per hour, a skydiver goes into either a diving or a standing² up posture³. This presents the least surface area downward, so her terminal velocity is highest. How Skydivers Land When a skydiver opens her chute, she’s increasing the amount of surface area she presents to the ground dramatically. Her terminal velocity slows enough for a soft landing.

1 velocity   

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。

2 standing   

n.持续，地位；adj.永久的，不动的，直立的，不流动的

参考例句：

• After the earthquake only a few houses were left standing.地震过后只有几幢房屋还立着。
• They're standing out against any change in the law.他们坚决反对对法律做任何修改。

3 posture   

n.姿势，姿态，心态，态度；v.作出某种姿势

参考例句：

• The government adopted an uncompromising posture on the issue of independence.政府在独立这一问题上采取了毫不妥协的态度。
• He tore off his coat and assumed a fighting posture.他脱掉上衣，摆出一副打架的架势。