Waves
How does light get from the sun to the earth? How does music get from the stage to the audience? They move the same way —in waves!
Light and sound are forms of energy. All waves carry energy, but they may carry it differently. Light and sound travel through different kinds of matter. For example, light waves cannot move through walls, but sound waves can. That is why you can hear people talking in another room even though you cannot see hem. The energy of some waves is destructive. An arthquake 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 in waves. 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 a vacuum. That is why light from the sun and distant stars can travel through space to the earth! (175 words)
听友401608747
我一定要坚持，不坚持去死去死，我听力一定要进步!还有我想问一下，我每回写这个都很慌乱，字好乱好乱，你们咋写那么整齐的啊
懒懒的小猪女孩
打卡第二十天
云深SAQ
Day10今天听懂了很多，上量单词书写错误，要继续努力鸭
小舒wow
cannot可以连着写吗？
云深SAQ 回复 @小舒wow：
我百度的，哈哈哈，我想了一下好像是这个道理
云深SAQ 回复 @小舒wow：
适用对象不同：“cannot”与“can not”在于前者适用于处理不可能概率事件，后者适用于处理关于一件事情的选择。短语“can not”是用于处理选择的，人们用“can not”来强调他们想要发生什么或者是选择什么
听友225551753
打卡第20天，希望作者大大，继续更新
