boundary

Compared meaning: the edge or limit of an area (noun).

比较义项：区域的边界、范围（名词）。

• boundary 本词

  The everyday, concrete word for a line separating two areas, such as a fence, wall, or river between properties or countries.

  日常用词，指分隔两个区域的具体分界线，例如篱笆、墙壁或两国之间的河流。

  The fence marks the boundary between the two properties.

  这道篱笆标出了两块地产之间的边界。

• bound

  A more formal or technical word for the outer limit of an area, usually used in the plural (bounds) or in mathematical contexts; the singular form sounds literary for a literal geographic edge.

  语气更正式或技术性的词，指区域的外部界限，通常用复数形式 bounds，或用于数学语境；单数形式用来指具体的地理边界时带有文学化的语气。

  Beyond that river lies the northern bound of the old kingdom.

  那条河的对岸，就是这座古老王国的北部边界。

Boundary and bound can both mean the edge of an area. Boundary is the everyday word for a line separating two areas. Bound is more formal or technical, usually used in the plural 'bounds'. Bound's verb and adjective uses are not compared here.

这两个词在这个义项上都可以指一个区域的边界，但 boundary 是日常用词，指两个区域之间具体、明确的分界线；bound 语气更正式或技技术性，这个义项下更常用复数形式 bounds，单数 bound 单独指具体地理边界的情况在日常口语中较少见。这里不比较 bound 作动词（表示被捆绑、被束缚，boundary 没有对应词形）或作形容词（表示必然的、准备前往某地的）等其他用法。