| English | Chinese |
| primary education The first five or six years of instruction in elementary schools | 初等教育 (第一个五年或六年制的小学教育。) |
| primary energy consumption Consumption of energy used in the same form as in its naturally occurring state, for example crude oil, coal, natural gas, e.g. before it is converted into electricity | 初级能源消费 (在能源消费中使用其天然状态的形式，如原油、煤炭、天然气、电能。) |
| primary forest Forest which originally covered a region before changes in the environment brought about by people | 原始森林 (不是由人种植的、原本的森林覆盖。) |
| primary sector That part of a country's or region's economy that makes direct use of natural resources, including agriculture, forestry, fishing and the fuel, metal and mining industries | 初级成分 (一个国家或地区的部分经济，直接使用天然资源，包括农业、林业、渔业和燃料、金属和采矿业等。) |
| primary sludge | 初级的污泥 |
| primary treatment Removal of floating solids and suspended solids, both fine and coarse, from raw sewage | 初级处理 (粗糙的、浮动的固体和暂时的固体去除。) |
| primary waste treatment | 初级的废物处理 |
| primary water treatment | 初级的水处理 |
