The borderline between two different or opposite things is the division between them.
例句
...a task which involves exploring the borderline between painting and photography.一项探究绘画与摄影之间界线的工作
ADJ-GRADED
勉强可以的;刚刚够格的
Something that is borderline is only just acceptable as a member of a class or group.
例句
Some were obviously unsuitable and could be ruled out at once. Others were borderline cases.一些明显不合适,可以马上排除。另一些则勉强合格。
英汉词典释义
n.
分界线,国界线
the borderline between myth and philosophy神话与哲学的分界线After the exams, the teacher gave all borderline cases a spoken test.考试后老师对那些在及格线上下的学生进行了一次口试。She’s on the borderline between a first- and second-class honours degree.她介于一等和二等荣誉学位之间。