boundaries
The boundary of an area of land is an imaginary line that separates it from other areas.
border , frontier
The Bow Brook forms the western boundary of the wood.
鲍溪成了树林的西边界。
The boundaries of something such as a subject or activity are the limits that people think that it has.
The boundaries between history and storytelling are always being blurred and muddled.
历史与故事的界限一直模糊不清。