名词中文翻译1
中文翻译：Unknown
同义词：
['guardian boundary', 'defense boundary', 'protection zone']
例句：
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1. The company's protection boundary is set at the city limits.
该公司的保护边界设在城市边界。
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2. The government has established a protection boundary around the national park.
政府已经为国家公园划定了保护边界。
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3.The boundary between their two countries is marked by a river.
他们两国之间的边界由一条河流划分。