singleton
noun [ C ] uk/ˈsɪŋ.ɡəl.tən/ us/ˈsɪŋ.ɡəl.tən/
(PERSON)
humorous独身之人，单身人士
a man or woman who does not have a romantic or sexual partner
(BABY)
单生儿;单生幼兽
one baby or baby animal that is born and is not a twin, etc.
(CARD)
games specialized单张（所发13张牌中属某一花色的唯一的一张那个牌）
a playing card that is the only one of that suit that a player has
Jack has a singleton in hearts. 杰克有一张唯一的红桃。