isotopesn.同位素名词isotope的复数形式.isotopen.同位素isotope fractionating同位素分离,同位素分凝,同位素分馏isotope encephalogram同位素脑图Isotope determination同位素法isotope incorporation同位素参入isotope exchange rate同位素交换速率isotope geochronology同位素地质年代学isotope tracer method同位素示踪法isotope fractionation同位素分离isotope placentograpy同位素胎盘定位isotope encephulogram同位素脑图