名词
中文翻译：Unknown
同义词：
['boundary', 'limit', 'barrier', 'demarcation']
例句：
-
1. The closed boundary between the two countries has been a source of tension for years.
两国之间的封闭边界多年来一直是紧张的根源。
-
2. The research team set up a closed boundary to study the effects of pollution on wildlife.
研究团队设立了一个封闭边界来研究污染对野生动物的影响。
-
3. The city's closed boundary effectively restricts access to certain areas.
城市的封闭边界有效地限制了对某些区域的进入。