oil spill The accidental release of oil, or other petroleum products usually into freshwater or marine ecosystems, and usually in large quantities. It can be controlled by chemical dispersion, combustion, mechanical containment, and absorption(意外泄漏的石油或其他石油产品，进入淡水或海洋生态系统，通常量大。它可以通过化学分散、燃烧、机械封堵和吸收加以控制。)
leakage The accidental, uncontrolled discharge or seepage of liquids, gases and other substances to unintended and unwanted locations, frequently causing risks of damage or harm to persons, property or the environment(液体、气体和其它有害物质偶然地、不受控制地向非意愿地区地排放或渗漏，经常造成人身、财产或环境的损害或伤害。)
seepage water Water that moves slowly through small openings of a porous material such as soil or the amount of water that has been involved in seepage(水慢慢通过很小的可渗透物质的开口例如泥土或已经泄漏的水。)
