每日習(xí)語（11.21）

black sheep
    不肖子女
    例句：
    Tom is the black sheep of his family.
    湯姆是個(gè)敗家子。
    operate
    做手術(shù)
    例句：
    The sooner we operate the safer.
    越早動(dòng)手術(shù)越安全。