2022年英语专四听力dictation练习(20)

2021-11-26 17:38:00来源:网络

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  Waves

  How does light get from the sun to the earth? How does musicget from the

  stage to the audience? They move the same way-----in waves!

  Light and sound are fomp3s of energy. All waves carry energy,but they may

  carry it differently. Light and sound travelthrough different kinds of matter.

  For example, light wavescannot move through walls, but sound waves can. That is

  why you can hear people talking inanother room even though you cannot see them.

  The energy of some waves is destructive. Anearthquake produces seismic

  waves.

  Catch a wave. Ask a friend to stand a few feet away from you. Stretch a

  spring between you.Shake the spring to transfer energy to it. What happens? The

  spring bounces up and down inwaves. When the waves reach your friend, they

  bounce back to you!

  Light waves travel 300,000 kilometers (186,000 miles) per second! They can

  also travel through avacuum. That is why light from the sun and distant stars

  can travel through space to the earth!

  Useful Words and Expressions;

  1. destructive 破坏的

  2. seismic地震的

  3. vacuum真空

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