Unit 342 Sally and I are twins．薩莉和我是雙胞胎。
    I can't tell you two apart.
    I can't tell John and Devid apart.
    cross-eyed
    I am cross-eyed.
    Sally and I are twins.
    No wonder.
    (No wonder you look so like.)
    He is my twin brother.
    She is my twin sister.
    It is said that he was sick.
    No wonder he didn't attend the meeting.
    No wonder he didn't go to the meeting.