名词
中文翻译：次级处理
同义词：
['sub-treatment', 'secondary purification例句：1. The wastewater is treated using a secondary treatment process.（废水通过二级处理过程进行处理。）']
例句：
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1. The wastewater is treated using a secondary treatment process.
废水通过二级处理过程进行处理。
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2. The plant uses secondary treatment to remove pollutants from the water.
该厂使用二级处理去除水中的污染物。
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3.In some cases, secondary treatment may be sufficient to meet environmental standards.
在某些情况下，二级处理可能足以达到环境标准。