Ostan纯氢氧化钠OSTabbr.科学与技术处(=office of science and technology)abbr.作战适用性试验(=operational suitability testing)ostium uteri externum子宫颈外口osteoplastic spreader骨科延长器ostium uteri internum输卵管腹腔口ostium sinoauriculare窦耳孔Osteocheilus hasseltin.哈赛尔特骨唇鱼(鲤科)Osteoarticular trauma骨关节创伤Osteoblast transplant成骨细胞移植Osteoclasis of fibula腓骨折骨术Osteoclasts/am eff破骨细胞/针灸效应Osteotomy of vertebra脊椎切骨术