| Subject | English | Chinese |
| environ. | secondary biotope In the case of disruption of an existing biotope, secondary biotope can be created as a compensation and substitute measure for the loss of the natural one | 次级生物群落 (在已存在的群落分裂的情况下，次级群落是失去原来群落的补充和替代方法。) |
| comp., MS | secondary customer | 次要客戶 (A customer that is linked to the primary customer in a customer relationship) |
| UN, econ. | secondary debt market | 次级债务市场 |
| environ. | secondary education The years of instruction following elementary school and until the end of high school | 中等教育 (在初等教育之后的教育，直到高中结束。) |
| hydroel.st. | secondary forest | 次生林 |
| UN, ecol. | secondary pollutant | 次生污染物 |
| UN, ecol. | secondary pollutant | 二次污染物 |
| math. | secondary process | 次级过程 |
| UN, tech. | secondary road conditions | 道路支线状况 |
| gen. | secondary school | 中学 |
| gen. | secondary school student | 中学生 |
| environ. | secondary sector The part of a country or region's economy that produces commodities without much direct use of natural resources | 制造业 (生产商品但不需要直接使用很多自然资源的国家或地区经济部门。) |
| environ. | secondary treatment Stage of the process of waste water treatment: following primary treatment by sedimentation, the second step in most wastewater systems in which biological organisms decompose most of the organic matter into a innocuous, stable form | 二次处理 (废水处理过程：在通过沉淀处理的第一次处理之后，大多数废水处理系统的第二步是微生物把有机物分解成无害的、稳定的状态。) |
| math. | secondary unit | 第二级单位，次级单位，第二阶段抽样单位 |