| English | Chinese |
| active participation The involvement, either by an individual or a group of individuals, in their own governance or other activities, with the purpose of exerting influence | 积极参与 (个人或团体为扩大影响而参与的事件) |
| active population The number of people available and eligible for employment within a given enterprise, region or nation | 活动人口 (在指定企业、地区或者国家中可已并适合雇佣的人数。) |
| most active period | 最活跃时期 |
| surface-active agent A substance that, when used in small quantities, modifies the surface properties of liquids or solids. A surface-active agent reduces surface tension in a fluid or the interfacial tension between two immiscible fluids, such as oil and water. Surfactants are particularly useful in accomplishing the wetting or penetration of solids by aqueous liquids and serve in the manner of detergent, emulsifying, or dispersing agents. They are more effective than soap in certain situations and are used by conservators for such purposes as cleaning, wetting, and dispersing | 表面活性剂 (小批量使用，用于改变液体或固体表面性质一种物质。采用表面活性剂降低表面流体或两个不混溶流体如油和水的界面张力。表面活性剂，特别是用于水的液体或固体润湿渗透有益和服务方式的洗涤剂，乳化或分散剂。他们比在某些情况下肥皂用作上述用途的清洗润湿方面更有效，且被环保专家用于此类目的的清洁、润湿和分散。) |
| surface active compound Any soluble substance composed of two or more unlike atoms held together by chemical bonds that reduces interfacial tension between liquids or a liquid and a solid, often used as detergents, wetting agents and emulsifiers | 表面活性化合物 (可溶性物质组成的两个或两个以上的不同原子由于化学键而结合在一起，可降低化学液体或液体与固体之间的表面张力，经常被用来作为洗涤剂、润湿剂和乳化剂。) |
