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2021英语四级听力：Waves

树图思维导图提供 2021英语四级听力：Waves 在线思维导图免费制作，点击“编辑”按钮，可对 2021英语四级听力：Waves 进行在线思维导图编辑，本思维导图属于思维导图模板主题，文件编号是：d11574bbb408fd243493a83e85e3bf6e

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Howdoeslightgetfromthesuntotheearth?Howdoesmusicgetfromthestagetotheaudience?Theymovethesameway-----inwaves!

Lightandsoundarefomp3sofenergy.Allwavescarryenergy,buttheymaycarryitdifferently.Lightandsoundtravelthroughdifferentkindsofmatter.Forexample,lightwavescannotmovethroughwalls,butsoundwavescan.Thatiswhyyoucanhearpeopletalkinginanotherroomeventhoughyoucannotseethem.Theenergyofsomewavesisdestructive.Anearthquakeproducesseismicwaves.

Catchawave.Askafriendtostandafewfeetawayfromyou.Stretchaspringbetweenyou.Shakethespringtotransferenergytoit.Whathappens?Thespringbouncesupanddowninwaves.Whenthewavesreachyourfriend,theybouncebacktoyou!

Lightwavestravel300,000kilometers(186,000miles)persecond!Theycanalsotravelthroughavacuum.Thatiswhylightfromthesunanddistantstarscantravelthroughspacetotheearth!

UsefulWordsandExpressions;

1.destructive破坏的

2.seismic地震的

3.vacuum真空