GbEng
边界从北部山地一直延伸到南部海岸. The frontier ranges from the northern hills to the southern coast.
边疆，边境位于或靠近边界的土地 Land located on or near a frontier.
这两国之间的边界问题历来是争议的焦点. The border has always been a bone of contention between these two countries.
军队按时沿边界巡逻. The army regularly patrol (along) the border.
气流分离移动的流线型的躯体上流体边界层上的分隔物，如飞机的机翼，在平滑的流体流动中会引起故障和湍流 A separation in the boundary layer of fluid about a moving streamlined body, such as the wing of an airplane, causing a breakdown in the smooth flow of fluid and resulting in turbulence.
边界线确立或标志边界的线 A line that establishes or marks a border.
那球被正站在边界线内的守场员接住了. The ball was caught by a fielder standing just inside the boundary.
国与国之间的边界未明确划定时，通常会发生纠纷。 When boundaries between countries are not clearly defined, there is usually trouble.