剑桥词典a birth defect of the heart in which a temporary blood vessel that supplies the unborn child does not close at birth 动脉导管未闭 The main sign of patent ductus arteriosus is a mechanical hum from the heart . 动脉导管未闭的主要迹象是心脏部分有机械嗡嗡声。 返回 patent ductus arteriosus