;t be seen. When the object moves faster than the speed of sound, the air is pushed hard, and it compresses... thing happens in the air, even if it can’t be seen. When the object moves faster than ……

步行自行车Many people love walking. It’s good for our health. How can we make walking more fun? A Japanese company invented (发明) a walking bicycle. When we walk on it, it moves. It is faster than walking. ……

, even if it can’t be seen. When the object moves faster than the speed of sound, the air... (猛击) the whip. Aircraft that travel faster than the speed of sound can also make sonic booms.A strong ……

Sound can travel about three times (倍) faster through water than air. ……

听两遍,选择正确答案。1. Miss Gorgers was teaching her class ______.A. about sound B. about travel C. about time 2. Tom thought that electricity was ______.A. slower than sound waves B. faster than sound wavesC ……

Coughing can cause air to move through yourwindpipe(气管) faster than the speed of sound — over 300 metres per second! ……

do it?2. Which moves faster, heat or cold?Key:1. His donkey's(or horse's...) name is Friday.2. Heat is faster. Because we can catch a cold. ……

happens in the air, even if you can’t see it. When the thing moves faster than sound, the air... moves faster than sound, the air is pushed hard, and it compresses (压缩) like the ripples in water ……

;t see it. When the thing moves faster than sound, the air is pushed hard, and it compresses (压缩) like...’s fastest traditional airplane.The idea of flying faster than sound might scare you ……

," he said. I was surprised by his sudden address. "Yeah, their raft moves a little faster than ours... and shook my head. "The water in the center of the steam moves faster than that near the bank," he ……

faster if you listen to the sound through the rail track rather than the air.According to scientists... an approaching train much faster if you listen to the sound through the rail track rather than ……

Faster than sound: Austrian pilot Felix Baumgartner became the first man to break the sound barrier... said traveling faster than sound is “hard to describe because you don’t feel it”. The pressurized ……

faster than ____________ (著名运动员） We also see a/an ____________（different animal) ____________ (动词...全家的特别旅行My family goes on a/an ____________ (形容词）trip in ____________（country). We drive a car ……

信不信由你
Sounds (声音) go faster in water than in the air. ……

more slowly.” But why would we sound a lot smaller than we are? In ancient times, our ancestors could... enough to eat or dangerously big. But on Venus, the speed of sound is much faster than it is on Earth ……