VOA标准英语2013.01.07
[audio]http://sound.yywz123.com/tingbbs/voa/voa20130107.mp3[/audio]In the 17th century, the French scientist Pierre Gassendi knew that light traveled faster than sound.在17世纪时,法国科学家皮埃尔`伽桑狄已经知道光速要比声速快.__________________________. Gassendi tried to measure the speed of sound by clocking the time that elapsed between the flash and the gunshot. Knowing the exact distance the gun was from him, he calculated that sound traveled through air at over 1,000 miles per hour. This figure is too high, though. Can you guess why?伽桑狄试图通过记录看到枪的火花和听到枪声之间的时差来测量声速.在知道枪支与自己所在位置的精确距离后,他计算出声音在空气中的传播速度约为1000英里/每小时.可是,这一数字过高.你能猜出为什么吗?
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