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| Subject | English | Chinese |
| tech. | lower class limit | 组下限 |
| tech. | lower class treatment of wastewater | 级处理 |
| ecol. | lower class treatment of wastewater | 污水一级处理 |
| ecol. | waste water lower class treatment | 污水简易处理主要是除去污水中的大量粗粒悬浮物，一般采用简单的过滤和物理沉淀方法 |
| ecol. | waste water lower class treatment | 污水一级处理 |