Cometsarestillregardedwithawebysomepeople.
Urbanrenewalprogramsstrivetoupgradeareasthatarebecomingslums.
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野
Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.
Alligatorsstillexistinsomeofthedank潮湿swampsandbayous小海湾ofAlabama'scoastalregions.
Withtheacquisitionofsmallercompaniesbylargerones,the1960'ssawawaveofnewconglomerates.