having more than one decidedly dissimilar aspects or qualities
示例
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
consisting of or involving two parts or components usually in pairs
示例
an egg with a double yolk|a double (binary) star|double doors|dual controls for pilot and copilot|duple (or double) time consists of two (or a multiple of two) beats to a measure