defect的甄选

defect的词根为fect例句1、TherewasnopositiveevidencethatanybirthdefectshadarisenasaresultofVitaminAintake.没有确凿证据证明，摄取维生素A会导致出生缺陷。2、Stammeringisprobablyaninheriteddefect.口吃很可能...