border

Compared meaning: the outer part or line of something (noun).

比较义项：边缘（名词）。

• edge

  General, everyday word for the outermost part of almost any object or surface (a table, a cliff, a pool); it does not imply two areas meeting.

  通用、日常用词，指几乎任何物体或表面最外的部分（如桌子、悬崖、泳池的边缘），并不暗示两个区域的交界。

  She stood at the edge of the pool before jumping in.

  她在跳进泳池之前站在池边。

• border 本词

  Refers specifically to the line separating two countries, regions or pieces of land; it sounds formal or geographic and is not used for the edge of an object.

  专指分隔两个国家、地区或地块的分界线，语气较正式、带有地理色彩，不用于物体的边缘。

  The river marks the border between the two small towns.

  这条河是两个小镇之间的分界线。

Edge and border both mean the outer part of something, but edge is the general, everyday word for the outermost part of almost any object or surface. Border is more formal and specific, meaning the line separating two countries, regions, or pieces of land.

这两个词在这一义项上都表示“边缘”，但侧重点不同：edge是通用词，指几乎任何物体或表面最外的部分；border专指两个区域、国家或地产之间的分界线，语气更正式、更具地理／政治色彩。

Compared meaning: the boundary line of an area (noun).

比较义项：分隔或围绕某一区域的边界线（名词）。

• border 本词

  Refers to the line separating two neighboring countries, regions, or plots of land; implies two sides facing each other; typical in political and geographic contexts (cross the border, border dispute).

  指两个相邻国家、地区或地块之间的分界线；暗示分界线两侧各有一方；常用于政治和地理语境（如“越过边境”“边界争端”）。

  Farmers on both sides use the river as the border between their land.

  两岸的农民都把这条河当作他们土地之间的边界。

• perimeter

  Refers to the entire outer boundary line enclosing a single area, often used for security or physical space around a building, camp, or field; no sense of two sides, common in phrases like 'around the perimeter'.

  指围绕单一区域（如建筑物、营地、田地）的整条外部边界线，常用于安保或物理空间语境；不涉及“两侧”的概念，常见搭配如“沿周边巡逻”。

  Security guards patrol the perimeter of the factory every two hours.

  保安每两个小时就沿着工厂的周边巡逻一次。

Border and perimeter both mean a boundary line, but border is the line between two neighboring countries or areas. Perimeter is the whole outer line enclosing one area, such as a building. Border can also mean a decorative edge; that sense is not compared here.

这两个词都表示“边界线”，但border强调两个国家、地区或地块之间的分界线，需要双方共同构成边界；perimeter则指围绕单一区域（如建筑物、营地）的整条外边线，常用于安保、巡逻等语境，不涉及“两侧”的概念。这里不比较border作为“花坛、页面等的镶边”这一义项。