Formerly , in the United States, many nurses worked as private duty nurses rather than in hospitals.
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InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
Somecosmeticsmanufacturersattempttocapturetherose'sunmistakablefragrance香味insoapsandperfumes.
Blue－greenalgaegrowabundantlyinsaltmarshes.