Formerly , in the United States, many nurses worked as private duty nurses rather than in hospitals.
A、PreviouslyA
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Bythenineteenthcentury,embroideryonmen'sclothinghadvirtuallydisappearedexceptfortheoccasionaldecorativevestandtie.
Insectpestsareamongtheleadingcausesofcropfailure.
Peoplewhodonotsleepenoughtendtobecomeirritable.
ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野
