第三人称单数：borderlines
名词分界线，国界线
形容词边界上的; 边界附近的; 暧昧的; 不明确的
1. （两种不同或相反事物之间的）分界线
The borderline between two different or opposite things is the division between them.
e.g. ...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
2. 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.
e.g. 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。