【英语时差8,16】后视镜的工作原理

 You’re driving at night when, suddenly!, you’re blinded by a piercing light from somewhere above. A car has driven up behind you, and its headlights–reflected in your rear-view mirror–are dazzlingly bright. You flick¹ the little tab beneath your mirror and the reflected headlights dim. Have you ever wondered how your rear-view mirror does this? Actually, your rear-view mirror is not just one mirror–it has two reflective surfaces. At the back is a regular, shiny mirror. Right in front of this primary mirror, however, is a thin, glass wedge which reflects only about four percent of the incoming light.

1 flick   

n.快速的轻打，轻打声，弹开；v.轻弹，轻轻拂去，忽然摇动

参考例句：

• He gave a flick of the whip.他轻抽一下鞭子。
• By a flick of his whip,he drove the fly from the horse's head.他用鞭子轻抽了一下，将马头上的苍蝇驱走。