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胎儿是生长在母体子宫腔内相对独立的个体,外界环境有害因素对胎儿发育具有不良的影响。妊娠期各种环境有害因素的直接或间接暴露,对胎儿发育潜在的生物效应各不相同,母体生理或病理状态下各发育阶段的胎儿对环境有害因素的易感性和敏感性不同,损伤的可逆或不可逆性及引致单一或多重器官的损伤等与有害因素作用的强度和剂量紧密联系。
The fetus is a relatively independent individual that grows in the uterine cavity of the mother. Adverse environmental factors have adverse effects on fetal development. Direct or indirect exposure of various environmental harmful factors during pregnancy has potential biological effects on fetal development. Fetal babies at various developmental stages in maternal physiological or pathological conditions have different susceptibility and sensitivity to environmental harmful factors. The damage is reversible Or irreversibility and lead to single or multiple organ damage and other harmful factors and the intensity of the role of dose.