Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.
DoubleEagleinthefirsttransatlanticballoon,wasgreetedbyavidcrowdsinFrance.
TheeconomyofDallas,Texas,isstronganddiversified.
Scientistshaveobtainedmoreevidence___________plasticisfindingitswayintothehumanbody.
城市最低生活保障制度的救助对象不包括()。
