- The boundary of an area of land is an imaginary line that separates it from other areas.
- The Mississippi River [密西西比河] forms a natural boundary between Iowa [爱荷华州] and Illinois [伊利诺伊州].
- The stream curves round to mark the boundary of his property.
- We walked through the churchyard towards the boundary wall.
- The boundaries of something such as a subject or activity are the limits that people think that it has.
- the boundaries between work and play
- within the boundaries of the law
- the boundaries of human knowledge
- new scientific discoveries that are stretching the borders of knowledge [区分也没有那么严格啦]
- The border between two countries or regions is the dividing line between them. Sometimes the border also refers to the land close to this line.
- The river lies on the border between the US and Mexico.
- A border is a strip or band around the edge of something.
- writing paper with a black border
- In a garden, a border is a long strip of ground along the edge planted with flowers.
- a flower and shrub [灌木] border
- A country that borders another country, a sea, or a river is next to it.
- countries that border the Mediterranean [地中海]
- If something is bordered by another thing, the other thing forms a line along the edge of it.
- His confidence bordered on arrogance [傲慢].
抄自柯林斯+LDOCE.