这些名词均含有“边界，边境”之意。
border : 多指国与国之间或两地区的分界处，即分界线附近的边缘部分。
- Were you stopped at the border?
你在边界被拦住了吗？ - The train crosses the border between France and Spain.
火车穿过法国和西班牙之间的边界。 - The two countries have had frequent border disputes.
两国经常发生边界纠纷。
bounds : 常与boundary换用，指土地边界，但意思不如boundary明确，主要用于抽象事物和文学作品中。
- The committee felt that newspaper coverage of the murder went beyond reasonable bounds.
委员会觉得报纸对谋杀案的报道超出了正常的范围。 - What you did was beyond/outside the bounds of acceptable behaviour.
你的所作所为令人无法接受。 - His desire for political power apparently knows no bounds (= seems to be unlimited).
他对政治权力的欲望显然没有止境。
boundary : 侧重地图上正式标定的、双方遵守的边界，也可指较小行政单位间的界线。
- The Ural mountains mark the boundary between Europe and Asia.
乌拉尔山脉是欧洲和亚洲的分界线。 - Residents are opposed to the prison being built within the city boundary.
居民们反对把监狱建在市区。
frontier : 指两国接壤的前沿地区，属于各国的国境和边疆，多指设防的边界。
- Some of the frontier between Germany and Poland follows the course of the river Oder.
德国与波兰的部分边界是沿奥德河划分的。 - Nepal has frontiers with both India and China.
尼泊尔与中国和印度都接壤。 - They lived in a town close to the frontier.
他们居住在一个离边界很近的城镇。
limit : 含义广泛，常用作复数。指任何界限、范围、分界线外面的部分，可指有形或无形的东西。
- We were reaching the limits of civilization.
我们快到蛮荒地界了。 - the city limits (= the imaginary line which officially divides the city from the area outside)
市区范围
