【英语时差8,16】如何计算光速

 How fast does light travel? What could you do to find out? One natural thing to try is to have someone send some light your way and see how long it takes to reach you. How about if you got a friend to shine a flashlight at you from a distant hill, exactly at midnight? With your stopwatch you start counting theseconds until you see the light. Galileo actually tried this kind of experiment, but without much success. Light goes much too fast to be timed in that way. Your tests would give you the same impression he got — that light moves infinitely¹ fast, reaching your eye the same instant² the flashlight is clicked³ on. This is, in fact, what people believed for a long time: that light moved infinitely fast.

1 infinitely   

adv.无限地，无穷地

参考例句：

• There is an infinitely bright future ahead of us.我们有无限光明的前途。
• The universe is infinitely large.宇宙是无限大的。

2 instant   

adj.紧迫的；立即的；本月的；已配制好的时刻；瞬息，霎时

参考例句：

• If you don't leave this instant,I will scream.你要是不马上离开，我就喊了。
• It all happened in an instant.这一切都发生在一刹那间。

3 clicked   

v.使发出咔哒声，使咔哒（或咔嚓）响( click的过去式和过去分词 )；突然明白；配合默契；在计算机荧光屏上用鼠标器)咔嗒一按

参考例句：

• The cameras clicked away. 照相机咔嚓咔嚓地不停拍照。
• He clicked his tongue to attract their attention. 他咂嘴发出啧啧声以吸引他们的注意。