twin1/twIn; twIn/n [C] one of two children who are born at the same time and have the same mother 双胞胎中的一个: My sister and I are identical twins (=twins that look exactly the same). 我和姐姐是单卵双胞胎。
twin2adj [only before noun 仅用于名词前] 1 used to describe a child who is a twin 双胞胎的: twin sister/brother 双胞胎姐妹/兄弟2 used to talk about two things of the same kind that are together or connected 成对的﹔密切相关的: twin beds 成对的单人床3 a twin room has two beds in it〔房间〕有两张单人床的