Data for the map were obtained from U. S. Geological Survey (USGS) and Environmental SystemResearchInstitute (ESRI).
地图数据源自美国地质调查局及环境系统研究所。
2
Research by the Institute of education published on April 21st looks at those corners of the state-education system where some parental choice does exist.
教育学院4月21日发表了一份研究报告，关注了那些英国教育体系中，确实给父母们一些选择余地的旮旯。
3
According to Mark Bromley of the Stockholm International Peace ResearchInstitute, Colombia has also been talking to Sweden about buying an airborne early-warning system and a tanker plane.