| Chinese | English |
| 城市扩张 | urban sprawl The physical pattern of low-density expansion of large urban areas under market conditions into the surrounding agricultural areas. Sprawl lies in advance of the principal lines of urban growth and implies little planning control of land subdivision. Development is patchy, scattered and strung out, with a tendency to discontinuity because it leap-frogs over some areas, leaving agricultural enclaves (市场条件下城市地区向周围农村地区进行低密度扩张的物理模式，扩张是以城市开发为主线推进，意味着对土地划分控制的较少规划。开发是零碎的、分散的、缓慢的，有不连续的倾向，因此它跨越过了一些地区，造成了农业上的飞地。) |
| 废气扩散 | waste gas dispersion The process of breaking up and producing a diffuse distribution of the unusable aeriform fluid or suspension of fine particles in air resulting from a manufacturing process or the burning of a substance in an enclosed area (对制造生产过程或在一个封闭区域内物质的燃烧而排放的无法使用的气状流体、或空气中的悬浮微粒进行分解，和产生扩散分布的过程。) |
| 扩展型 | expansion type |
| 扩展政策 | enlargement policy |
| 扩展编程 | enlargement programme |
| 扩散 | dispersion A distribution of finely divided particles in a medium (细小分离粒子在介质中的分布。) |
| 扩散 | diffusion The spontaneous movement and scattering of particles (atoms and molecules), of liquid, gases, and solids (液体、气体和固体颗粒(原子和分子)的自发性移动与分散现象。) |
| 扩散污染 | diffuse pollution Pollution from widespread activities with no one discrete source, e.g. acid rain, pesticides, urban run-off etc. (由非单一原因的广泛活动造成的污染。例如酸雨、农药、城市下水堵塞等。) |
| 扩散源 | diffuse source Pollution which arises from various activities with no discrete source (从非离散来源的各种活动产生的污染物。) |
| 扩散计算 | dispersion calculation The calculation of pollutant dispersion is based on the use of air dispersion models that mathematically simulate atmospheric conditions and behaviour. Dispersion models can provide concentration or deposition estimates and can be used to evaluate both existing and hypothetical emissions scenarios (污染扩散的计算是基于空气扩散模型通过数学方法来模拟大气条件和行为；扩散模型可以估计污染物的浓度或沉降量，同时可以评估现有或假设的排放情形。) |
| 污染物扩散 | pollutant dispersion The spreading of pollutants from a point of release in air, soil and water. The dispersion of air pollutants is heavily influenced by how and where the pollutant is emitted, e.g., by continuous low-level versus accidental releases, multiple stacks versus a few, or the height of the stacks. The nature of the local terrain meteorology and the chemistry of the released material strongly influence the pattern of regional and, finally, global dispersion and transport (污染物通过传播释放到空气、土壤和水中。空气污染物扩散的问题是在哪里及如何处理污染物的排放，例如通过连续的少量的释放，或多重叠加的释放。局部地形气象学和化学物质属性会强烈影响释放的模式。最后，污染物扩散涉及到区域和全球的分散性和运输。) |
| 美国空气扩散委员会 | Air Diffusion Council |
