Or no animal studies have been conducted and there are no adequate and well-controlled studies in pregnant women.

或者，没有在动物中进行实验，也没有对妊娠妇女进行充分、严格的对照研究。

youdao

Animal studies have revealed no evidence of harm to the fetus, however, there are no adequate and well-controlled studies in pregnant women.

动物实验没有发现对胎儿有害的证据，但没有对妊娠妇女进行充分、严格的对照研究。

youdao

Or animal studies have shown an adverse effect, but adequate and well-controlled studies in pregnant women have failed to demonstrate a risk to the fetus.

或者，动物实验出现了不良作用，但对妊娠妇女进行了充分、严格的对照研究，没有发现对胎儿的危险。

youdao