The Salk vaccine is a major factor in the fight to eradicate polio.
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Inliterature,caricatures讽刺画usuallycontainverbalexaggerationthroughwhichthewriterachievescomicandoftensatiric讽刺effects.
Whencarbonisaddedtoironintheproperproportions,theresultissteel.
Formerly,intheUnitedStates,manynursesworkedasprivatedutynursesratherthaninhospitals.
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
WhileBillieHolidaydidnotinventthemusiccalled"theblues",shemostassuredlyhelpedpopularizeit.