名词
中文翻译：外部排水系统
同义词：
['outside drainage system', "external water discharge system例句：1. The company's external drains are responsible for collecting wastewater from the factory.（该公司的外部排水系统负责收集工厂的废水。）"]
例句：
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1. The company's external drains are responsible for collecting wastewater from the factory.
该公司的外部排水系统负责收集工厂的废水。
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2.The construction of an external drain is essential for maintaining the cleanliness of the city.
建设一个外部排水系统对于保持城市的清洁至关重要。
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3.The external drains were designed to prevent flooding during heavy rains.
外部排水系统被设计成在大雨时防止洪水泛滥。