bounds

border, bounds, boundary, frontier, limit

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。
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。
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。
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。
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。

名词 bounds:

1. the line or plane indicating the limit or extent of something
   同义词：boundary, bound

名词 bound:

1. a line determining the limits of an area
   同义词：boundary, edge, bound
2. the line or plane indicating the limit or extent of something
   同义词：boundary, bound
3. the greatest possible degree of something
   同义词：limit, bound, boundary
4. a light, self-propelled movement upwards or forwards
   同义词：leap, leaping, spring, saltation, bound, bounce

动词 bound:

1. move forward by leaps and bounds
   同义词：jump, leap, bound, spring
2. form the boundary of; be contiguous to
   同义词：bound, border
3. place limits on (extent or access)
   同义词：restrict, restrain, trammel, limit, bound, confine, throttle
4. spring back; spring away from an impact
   同义词：bounce, resile, take a hop, spring, bound, rebound, recoil, reverberate, ricochet

1. Our joy knew no bounds. Your remarks exceed the bounds of reason.
   我们快乐无比。你的评论超出了合理界限
2. Her health is improving by leaps and bounds.
   她的健康迅速好转。
3. The exceeding of due bounds or limits.
   越界超过正当的界限或限制