名词
中文翻译：封闭的海域
同义词：
['closed ocean', 'enclosed sea']
例句：
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1.The closed sea is an important source of fishery resources.
封闭的海域是重要的渔业资源来源。
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2.The closed sea is a crucial part of the ecosystem.
封闭的海域是生态系统中至关重要的一部分。
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3. The closed sea has been closed for many years due to pollution.
由于污染，封闭的海域已经关闭多年。