borderline

borderline
noun
  1. a boundary separating two countries or areas
    边界线
    ■(figurative)a division between two distinct or opposite things
    (喻)分界线
    the borderline between ritual and custom.
    礼节和风俗之间的分界线。
adjective
  1. only just acceptable in quality or as belonging to a category
    不大合乎标准的,边缘的,含混不清的,不确定的
    references may be requested in borderline cases.
    当遇到不确定的案例时可要求证明材料。
英语宝典
考试词汇表