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| English | Chinese |
| tertiary sector The part of a country or region's economy that produces services or assets lacking a tangible and storable form | 第三产业部门 (一个国家或地区经济的一部分，生产服务或资产缺乏有形的和可存储的形式。) |
| tertiary treatment The process which remove pollutants not adequately removed by secondary treatment, particularly nitrogen and phosphorus; accomplished by means of sand filters, microstraining, or other methods (referring to wastewater treatment) | 三级处理 (去除污染物的过程中通过二级处理没有充分去除污染物，特别是氮、磷污染物的去除；由砂过滤器、微滤或其他方法完成(指污水处理)。) |
| tertiary waste treatment | 三级的废物处理 |
| tertiary water treatment | 三级水处理 |