All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.
D
暂无解析
Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.
Alligatorsstillexistinsomeofthedank潮湿swampsandbayous小海湾ofAlabama'scoastalregions.
Thefirstpaperwasmadefromthebarkofthemulberrytree.
Whencarbonisaddedtoironintheproperproportions,theresultissteel.