单词：singletons
(singleton 的复数) n. 一个, 独生子, 独身
plural of singleton
n. a single object (as distinguished from a pair)
n. a set containing a single member
n. the playing card that is the only card in a suit held in a bridge hand as initially dealt
n. a single object (as distinguished from a pair)
n. a set containing a single member
n. the playing card that is the only card in a suit held in a bridge hand as initially dealt