/ˈbɔ:də(r) ||; ˈbɔrdɚ/noun[C] 1 a line that divides two countries, etc; the land close to this line 国界；边疆: The refugees escaped across / over the border. 难民越境逃亡。the Moroccan border 摩洛哥边境the border between France and Italy 法国和意大利两国的疆界Italy's border with France 跟法国接壤的意大利边境
We use border and frontier to talk about the line that divides two countries or states. We usually use border to talk about natural divisions The river forms the border between the two countries. Boundary is usually used for the line that divides smaller areas the county boundary border 和 frontier 指国与国、州与州之间的分界线。如果是天然疆界，通常用 border：The river forms the border between the two countries. 这条河形成两国强界。boundary 通常指较小地区的分界：the county boundary 县（或郡等）的界线 2 a band or narrow line around the edge of sth, often for decoration 绲边；滚边；边: a white tablecloth with a blue border 绲蓝边的白色台布