n.[C]

1. 邊界，分界線[（+between）]
   The river is the boundary between the two countries.

   這條河是兩國的分界線。

2. 界限，範圍
   With the advance in science, the boundaries of human knowledge are being pushed further out.

   隨著科學的發展，人類知識的範圍在不斷擴大。

n.

1. a line marking the limits of an area.
2. Cricket  a hit crossing the limits of the field, scoring four or six runs.