ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
AlthoughtheCarbon14methodofdatingoldobjectsisnotfoolproof,itisthebestmethodavailableatpresent
对老年人经济上供养、生活上照料和精神上慰藉的义务，属于老年人享有的()。
In1974HenryAaronbrokeBabeRuth'smonumentallifetimerecordof714homeruns.
Theoldladycan'thopeto_____hercoldinafewdays.
