| Chinese | English |
| 从沉淀室排出的在养殖单元底部积累的固体物质和水的混合物。污水处理中：在大部分液体从污水中被除去后保留下来的泥泞、半固体沉淀物. | sludge |
| 包裹运输单 | dispatch note |
| 单亲家庭住宅 | single family dwelling An unattached dwelling unit inhabited by an adult person plus one or more related persons (由一个成人和一个或多个有亲缘关系的人员居住的一个单独的住所) |
| 单位人口资料 | per capita data No definition needed (无需定义。) |
| 单位叶速度指叶生长 | unit leaf rate |
| 单位叶速度 | unit leaf rate |
| 单元演替顶极理论 | monoclimax theory |
| 单宁 | tannin One of a group of complex organic chemicals commonly found in leaves, unripe fruits, and the bark of trees. Their function is uncertain though the unpleasant taste may discourage grazing animals. Some tannins have commercial uses, notably in the production of leather and ink; used in tanning, as a mordant in dyeing, and in ink manufacture (复杂的有机化学品，常见于叶子，未成熟的水果和树木的树皮。它的功能不确定但令人不快的味道可能不允许用于放牧牲畜。有一些单宁具有商业用途，特别是在皮革和油墨生产；用于制革，作为媒染剂染色和油墨制造材料。) |
| 单独行动 | lone wolf action |
| 单胁迫因子 | single stress factor |
| 废料分类单位 | waste sorting unit Centralized recycling centres to which waste materials are brought and where they are separated (废料被收集并分离的集中回收中心。) |
| 旅游单位 | touristic unit No definition needed (无需定义) |
| 林业单位 | forestry unit Any entity or group of individuals involved with the creation, management and conservation of an extensive area of woodland, often to produce products and benefits such as timber, clean water, biodiversity and recreation (任何单位或一组个人，涉及和大面积的林地的创造，管理，保护有关的活动，通常目的是为了产生产品和收益，例如木材，清洁水，生物多样性和娱乐休闲。) |
| 清单 | inventory A detailed list of articles, goods, property, etc. (用品、货物或财产等的详细列表。) |
| 环境影响单位 | environmental impact unit |
| 石油污染研究单位 | Oil Pollution Research Unit |
| 红色名单 | red list The series of publications produced by the International Union for the Conservation of Nature and Natural Resources (IUCN). They provide an inventory on the threat to rare plants and animal species. Information includes status, geographical distribution, population size, habitat and breeding rate. The books also contain the conservation measures, if any, that have been taken to protect the species. There are five categories of rarity status: endangered species; vulnerable organisms, which are those unlikely to adapt to major environmental effects; rare organisms, which are those at risk because there are few of them in the world, such as plants which only grow on mountain peaks or on islands; out of danger species, which were formerly in the above categories, but have had the threat removed because of conservation actions; and indeterminate species, which are the plants and animals probably at risk, although not enough is known about them to assess their status (自然和自然资源保护国际联盟(IUCN)出版的一套出版物。他们出版了濒临灭绝的植物和动物的详细目录。信息包括状态、地理分布、数量、习性和繁殖率。如果已经有任何已经用到的保护种群的方法，书中也有记录。稀有状态分成五类：濒临灭绝的物种；脆弱的物种，指那些不能适应主要的环境影响的物种；稀少物种，指那些因为存在量很少而有风险的物种，例如只生长在山峰上的或岛上的植物；不危险的物种，指不在前面几类中的物种，因为保护行动解除了威胁；不确定的物种，指可能有危险的植物和动物，但对它们的物种情况了解不够，不能评价它们的状态。) |
