In1974HenryAaronbrokeBabeRuth'smonumentallifetimerecordof714homeruns.
A、archaic(old,antique)Double Eagle in the first transatlantic balloon, was greeted by avid crowds in France.
The Salk vaccine is a major factor in the fight to eradicate polio.
Some animals pant and sweat to speed evaporation of body moisture and thus cool themselves.
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
Cometsarestillregardedwithawebysomepeople.
