运动休闲—高尔夫球的酒窝 Golf balls

 　　Why do golf balls have dimples(酒窝, 涟漪)? So that they look cute? NO! 

　　Because the dimples maximize the distance golf balls travel. Dimpled balls travel up to four times farther¹ than smooth-surfaced golf balls.

　　In the early days of golf, smooth-surfaced balls were used until golfers discovered that old, bumpy² balls traveled longer distances. The science of aerodynamics(空气动力学) helps explain the dimpled phenomenon. The dimples reduce the drag on a golf ball by redirecting more air pressure behind the golf ball rather than in front of it. The higher levels of pressure behind the golf balls force them to go far distances.

　　The dimples change the levels of pressure by bringing the main air stream very close to the surface of the golf ball. The dimples, or "turbulators," increase the turbulence³ in the layer of air located next to the surface of the ball. This high-speed air stream near the ball increases the amount of pressure behind the ball-thereby forcing the ball to travel farther.

1 farther   

adj.更远的，进一步的；adv.更远的，此外；far的比较级

参考例句：

• I can throw the ball farther than you can.这个球我能比你扔得远。
• The farther hill is five kilometres away.那座更远的小山在五公里以外。

2 bumpy   

adj.颠簸不平的，崎岖的

参考例句：

• I think we've a bumpy road ahead of us.我觉得我们将要面临一段困难时期。
• The wide paved road degenerated into a narrow bumpy track.铺好的宽阔道路渐渐变窄，成了一条崎岖不平的小径。

3 turbulence   

n.喧嚣，狂暴，骚乱，湍流

参考例句：

• The turbulence caused the plane to turn over.空气的激流导致飞机翻转。
• The world advances amidst turbulence.世界在动荡中前进。