having two parts or aspects; double
"an egg with a double yolk"
"a double (binary) star"
"dual controls for pilot and copilot"
"duple (or double) time consists of two (or a multiple of two) beats to a measure"
"a double (or dual) role for an actor"
"the office of a clergyman is twofold; public preaching and private influence"
"every episode has its double and treble meaning"
"ancient Greek had the dual form but it has merged with the plural form in modern Greek"
His laugh had a dual function, partly to applaud his jest, partly to cloak his anger.
出自： F. O
Everyone..holds dual citizenship in the kingdom of the well and in the kingdom of the sick.
出自： S. Sontag