名词
中文翻译：边界标志
同义词：
['border mark', 'demarcation sign']
例句：
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1.The boundary between our two countries is marked by a tall fence.
我们两国之间的边界由一道高高的围栏标记。
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2.The border patrol keeps an eye on the crossing points to prevent illegal immigration.
边境巡逻队密切关注过境点，以防止非法移民。
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3.The boundary line has been disputed for years over who owns the land.
多年来，这块土地的边界线一直因归属问题而争议不断。