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.
B
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ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.
MaryMcCarthyssatires讽刺文学arecouchedinaprosestylethathasaclassicprecision.
Creamoftartar酒石,aweakacid,canbeaddedtoeggwhitestohelpthemfoam泡沫whentheyarebeaten
TheeconomyofDallas,Texas,isstronganddiversified.