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| English | Chinese |
| natural self-purification | 自然的自净作用 |
| natural self-purification | 自净能力 |
| self-help programme A series of steps or a system of services or activities designed to enable an individual to help or improve one's self without depending on the aid of others | 自助计划 (一系列步骤或一套服务或活动，用来使个人不需要依靠他人帮助就能实现自身目标。) |
| self-monitoring No definition needed | 自我监视 (不需要定义。) |
| self-purification A natural process of organic degradation that produces nutrients utilized by autotrophic organisms | 自我净化 (生物腐烂产生能被腐生生物利用的物质的自然过程。) |
| self-purifying capacity | 自然的自净作用 |
| self-purifying capacity | 自净能力 |