Creamoftartar酒石,aweakacid,canbeaddedtoeggwhitestohelpthemfoam泡沫whentheyarebeaten
Urbanrenewalprogramsstrivetoupgradeareasthatarebecomingslums.
Thefirstpaperwasmadefromthebarkofthemulberrytree.
DoubleEagleinthefirsttransatlanticballoon,wasgreetedbyavidcrowdsinFrance.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.