词汇	primary substance
释义	primary substance 第一本质
随便看	prolonged descent prolonged detention prolonged diet session prolonged disability prolonged discussion prolonged disease involving kidney prolonged downward prolonged draught prolonged driving prolonged drought prolonged dwell peritoneal dialysis prolonged episodes of ventricular tachycardia prolonged erosion test prolonged exposure prolonged exposure to harmful radiation prolonged extracorporeal circulation prolonged fever of unknown origin Prolonged first stage of labor prolonged flooding prolonged frontal rain prolonged gestation Prolonged gestation prolonged heating prolonged howl prolonged humidity cycling