The megaphone(microphone) makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in all directions.
A、slitheringB
暂无解析
Blue－greenalgaegrowabundantlyinsaltmarshes.
TheNativeAmericaninterpreterSacajaweawasavaluablememberoftheLewisanddarkexpeditionin1805.
Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.
All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.
The wheels of the first road vehicles were fashioned from crude stone disks.
