Metropolitan Regional Information Systems大都会区域信息系统 Materiel Readiness Information System物料准备信息系统 Modernization Resource Information System现代化的资源信息系统 Mineral Rights Information System采矿权信息系统 Material Readiness Index System资料准备就绪的指标体系 Medically Recommended Intensive Supervision (parole)强化监理(假释的医疗建议) Minimum Register Instruction Sequence登记指令序列的最小 Microwave Reflectometer Ionization SensorReflectometer微波电离传感器 Mission Requirements Information System (Space Station)任务要求的信息系统(空间站) Magnetic Resonance Imaging and Spectroscopy核磁共振成像和光谱