ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
A、exhibitionThe first important exposition in the United States was held in Philadelphia in 1876.
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
Urbanrenewalprogramsstrivetoupgradeareasthatarebecomingslums.
Thefearofsmallpox,whichterrorizedtheeighteenthcentury,hasnoanalogy(likeness)today.
Anoversight遗漏(miss,overslaugh)inproofreadingoftenresultsinprintederrors.
