【英语时差8,16】为什么飞盘会飞？（下）

 Frisbees and compact discs have the same advantages as far as gyroscopic force is concerned, but there’s another physical property that gives your frisbee¹ an aerodynamic edge over your music collection. The top surface of a frisbee is curved. It’s wider in the middle and tapers² at the edges somewhat like the wing of an aircraft. This is no accident. Air moves more quickly over a curved surface than over a flat one, and this faster moving air above your frisbee has lower air pressure than the slow moving air beneath it. The higher pressure on the frisbee’s bottom pushes gently upward for a longer flight, an effect known as “lift.” You can even use lift to make your frisbee fly a curving path. Throw the frisbee not horizontally, but at a slight angle. The lift will push the disk in the direction the curved surface is pointing. Use a sharp enough angle, and the frisbee will swing back toward you like a boomerang!

1 frisbee   

n.飞盘(塑料玩具)

参考例句：

• We always go to the park on weekends and play Frisbee.我们每个周末都会到公园玩飞盘。
• The frisbee is a light plastic disc,shaped like a plate.飞盘是一种碟形塑料盘。

2 tapers   

（长形物体的）逐渐变窄( taper的名词复数 )； 微弱的光； 极细的蜡烛

参考例句：

• The pencil tapers to a sharp point. 铅笔的一段细成笔尖。
• She put five tapers on the cake. 她在蛋糕上放了五只小蜡烛。