Definition: one of two children who are born to the same mother at the same time Level: B1
我姐姐有一对双胞胎儿子。
My sister has ___twin sons.
莎拉是我的双胞胎姐妹。
Sarah is my ___twin sister.
我有一对双胞胎表亲，我非常爱他们。
I have ___twin cousins who I love very much.
