The economy of Dallas, Texas, is strong and diversified .
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TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
TheNativeAmericaninterpreterSacajaweawasavaluablememberoftheLewisanddarkexpeditionin1805.
Someseaurchins海胆havevenomous(toxin)spines
Anoversight遗漏(miss,overslaugh)inproofreadingoftenresultsinprintederrors.