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- 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.
- 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.
- 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.
- 他们画出了足球场地的边界。
They marked the boundaries of the football fields.
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