一個,獨生子,獨身
Singleton \Sin"gle*ton\, n. In certain games at cards, as whist, a single card of any suit held at the deal by a player; as, to lead a singleton.
singleton n 1: a single object (as distinguished from a pair) 2: a set containing a single member 3: the playing card that is the only card in a suit held in a bridge hand as initially dealt