Formerly , in the United States, many nurses worked as private duty nurses rather than in hospitals.
A、PreviouslyA
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People who do not sleep enough tend to become irritable .
Peoplewhodonotsleepenoughtendtobecomeirritable.
Some animals pant and sweat to speed evaporation of body moisture and thus cool themselves.
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.視野
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
