The first paper was made from the bark of the mulberry tree.
A、driedwoodB
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Whencarbonisaddedtoironintheproperproportions,theresultissteel.
Amythical(imaginary)creature,thedragonwasbelievedtohavelion'sclaws,scalyskin,andfierybreath.
InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.
ThecompanyissuesanannualreporteveryMarch.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
