The aboe discussion on the relatiely late proliferation of opioid receptors and the primarily postnatal deelopment of inhibitory controls to spinal cord transmission, would lead most to conclude that opioids hae little impact on the fetus.

• 以上关于阿片受体较晚形成和抑制控制功能出生后方可形成的讨论，很容易得出这样的结论：阿片剂对胎儿影响很小。