双胎活婴
Twins both liveborn
Twin unspecified as to place of birth
产钳分娩的单胎分娩
Other and unspecified forceps delivery
产钳分娩未提及指征者的单胎分娩
Vacuum extractor delivery
单单列滚柱轴承
single row roller bearing
单活塞爆炸压力机
single-piston explosive press
单活塞杆双作用缸
single rod double acting cylinder
单活塞压力真空计
single piston pressure-vacuum gauge
单活性中心催化剂
three bases education
single living-center catalyst
single-site catalyst
单胎顺产
Single spontaneous delivery unspecified
single-fetus delivery