Formerly , in the United States, many nurses worked as private duty nurses rather than in hospitals.
A、PreviouslyA
暂无解析
ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
AlthoughtheCarbon14methodofdatingoldobjectsisnotfoolproof,itisthebestmethodavailableatpresent
Insectpestsareamongtheleadingcausesofcropfailure.
Communicationisoneofthemostimportantbondsthatholdculturalsystemstogether.
Alllivingorganisms,regardlessoftheiruniqueidentity,havecertainbiological,chemical,andphysicalcharacteristicsincommon.
