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
MaryMcCarthyssatires讽刺文学arecouchedinaprosestylethathasaclassicprecision.
DoubleEagleinthefirsttransatlanticballoon,wasgreetedbyavidcrowdsinFrance.
Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.
ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
Formerly,intheUnitedStates,manynursesworkedasprivatedutynursesratherthaninhospitals.
