Although the Carbon 14 method of dating old objects is not foolproof , it is the best method available at present
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TheeconomyofDallas,Texas,isstronganddiversified.
Creamoftartar酒石,aweakacid,canbeaddedtoeggwhitestohelpthemfoam泡沫whentheyarebeaten
ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.