2021年12月英语四级听力:Waves
树图思维导图提供 2021年12月英语四级听力:Waves 在线思维导图免费制作,点击“编辑”按钮,可对 2021年12月英语四级听力: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:d02fc479b7344de2c11e8051be21aae6
2021年12月英语四级听力:Waves思维导图模板大纲
Waves
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