borderlines
n. 分界线,国界线( borderline的名词复数 )
The borderline between two different or opposite things is the division between them.
...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
Something that is borderline is only just acceptable as a member of a class or group.
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。
The construction blueprint is full of borderlines. I am really blind to them.
这张建筑图纸满是红线, 我实在看不懂.