Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
An oversight 遗漏 (miss, overslaugh) in proofreading often results in printed errors.
Someanimalspantandsweattospeedevaporationofbodymoistureandthuscoolthemselves.
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.