| Chinese | English |
| 一次性包装 | non-returnable container Any container for which no specific provisions for its return from the consumer or final use has been established (无特别要求消费者归还或已消耗完成的包装。) |
| 一氧化二氮 | nitrogen monoxide A colourless gas, soluble in water, ethanol and ether. It is formed in many reactions involving the reduction of nitric acid, but more convenient reactions for the preparation of reasonably pure NO are reactions of sodium nitrite, sulphuric acid, etc. (一种无色气体，易溶于水、乙醇和乙醚。它形成于一些硝酸还原反应中，但更方便的制备纯氧化氮反应的是亚硝酸钠、硫酸等反应。) |
| 一氧化氮 | nitrogen oxide A colorless gas that, at room temperature, reacts with oxygen to form nitrogen dioxide; may be used to form other compounds, NOx (一种无色气体，在室温条件下，与氧气反应生成二氧化氮，可被用来形成其它化合物。) |
| 一氧化碳 | carbon monoxide Colorless, odourless, tasteless, non-corrosive, highly poisonous gas of about the same density as that of air. Very flammable, burning in air with bright blue flame. Although each molecule of CO has one carbon atom and one oxygen atom, it has a shape similar to that of an oxygen molecule (two atoms of oxygen), which is important with regard to it's lethality, CO (无色、无味、无腐蚀性的、有剧毒的气体，密度和空气一样大。极易燃烧，在空气中燃烧时，有明亮的蓝色火焰。尽管每一个一氧化碳分子有一个碳原子一个氧原子，但它的形状和氧分子相似，这是一氧化碳致死性的一个重要因素。) |
| 一氧化碳污染试验 | carbon monoxide pollution experiment |
| 一般行政秩序 | general administrative order An administrative mandate outlining the process by which a concept, plan, decree or law is to be put into actual practice by a specific organization or government agency (政府，组织提出的概念，计划，法令或法律的实施的行政过程大纲。) |
| 三位一体的原则 | trinity of principles trias of environmental policy principles: precautionary, originator (polluter-pays) and cooperation principle; Three fundamental principles of environmental policy: precautionary principle, polluter pays-principle and cooperation principle (环境政策的三个基本原则：预报原则、污染者付费原则和合作原则。) |
| 专一传输 | unitransport |
| 去除一氧化碳 | carbon dioxide removal |
| 朗伯一毕尔二氏消光法则 | Lambert-Beer's extinction law |
| 硫一氧化碳 | sulphur monoxide A gas at ordinary temperatures; produces an orange-red deposit when cooled to temperatures of liquid air; prepared by passing an electric discharge through a mixture of sulfur vapor and sulfur dioxide at low temperature (普通温度下的气体。当冷却到液态空气温度时产生橘红色的沉淀；硫蒸气和二氧化硫的混合物在低温条件下的放电而生成。) |
| 第一族元素 | element of group Any of the monovalent metals lithium, sodium, potassium, rubidium, caesium, and francium, belonging to group 1A of the periodic table. They are all very reactive and electropositive; alkaline (任何单价金属，如：锂、钠、钾、铷、铯，属于周期表的1A族，反应性高，带正电。) |
| 第一演替阶段 | first stage of succession |
| 统一系统安全分析 | unified system safety analysis |
| 辐射一对流模式 | radioactive-convective model |
