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
In1861itseemedinevitablethattheSouthernstateswouldbreakawayfromtheUnion.
Someseaurchins海胆havevenomous(toxin)spines
Withtheacquisitionofsmallercompaniesbylargerones,the1960'ssawawaveofnewconglomerates.
Formerly,intheUnitedStates,manynursesworkedasprivatedutynursesratherthaninhospitals.
Batsfly,ratherthanglide,andthusaretheonlymammalscapableoftrueflight.
