名词
中文翻译：Unknown
同义词：
['border marker', 'border sign', 'boundary line marker', 'national border marker']
例句：
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1. The national border marker is an important symbol of national sovereignty.
国家边界标志是国家主权的重要象征。
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2. The border markers were carefully placed to ensure the security of the crossing.
边境标志被仔细放置以确保过境的安全。
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3. The national border marker was a symbol of the country's pride and identity.
国家边界标志是该国骄傲和身份的象征。