名词
中文翻译：无限制的含水层
同义词：
['unconfined groundwater', 'unconfined groundwater aquifer']
例句：
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1. The unconfined aquifer is the primary source of water for many cities.
无限制的含水层是许多城市的主要水源。
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2. The unconfined aquifer is prone to contamination due to its proximity to the city.
由于靠近城市，无限制的含水层容易受到污染。
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3. The unconfined aquifer provides essential nutrients for plant growth.
无限制的含水层为植物生长提供了必需的养分。