1
- a boundary separating two countries or areas边界线。
1.1
- figurative a division between two distinct or opposite things〈喻〉（事物的）分界线：
the borderline between ritual and custom.
礼节和风俗之间的分界线。
- 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。