Because the umbilical cord is part of the fetus tissue,so it is valuable to apply umbilical cord in risk assessment of prenatal exposure to toxicants.是什么意思_Because the umbilical cord is part of the fetus tissue,so it is valuable to apply umbilical cord in risk assessment of prenatal exposure to toxicants.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句