border
词根词缀：
border n. 边境
bord 边 + er 表名词 → 边境
bordering n. 边界标志物
border 边境 + ing 表名词 → 边界标志物
borderline n. 边界，边缘
border 边境 + line 直线，线条 → 边界，边缘
transborder adj. 横穿边境的
trans 横过 + border 边境 → 横穿边境的
数据来源：新东方英语词汇速记大全
相关例句：
The border between China and Korea has been formally delimited.
中国与朝鲜的边界已正式划定了。
Traders generally travel safely through the border.
商人通常可以安全通过边界。
The government has started building fortifications along its eastern border.
政府已经开始沿东部边境修筑防御工事。
The men lost their way in a sandstorm and crossed the border by mistake
那些人在沙尘暴中迷了路，不小心穿越了边境。
The main road from Murmansk to the Norwegian border is still closed to foreigners
从摩尔曼斯克到挪威边界的主路仍对外国人关闭。
Hungary's opening of the border was a turning point for the refugees.
匈牙利开放边境对难民来说是个转机。