prematures早产儿prematureadj.提前的；过早的；早产的n.早产儿；早熟premature ventricular beat室性期前收缩premature failure of paint漆膜的过早破损premature amniotic rupture沥浆产Premature ventricular beats室性期前收缩Premature senility syndrome早老综合征premature nodal contraction结性早搏premature eruption of tooth早萌Premature abnormal placenta早熟异常胎盘Premature ventricular heats室性早搏premature tricuspid closure三尖瓣提前关闭