胎先露的英文：
fetal presentation

I sleep in the fetal position.
我以胎儿的姿势入睡。

Claimed that fetal development parallels the evolution of the species.
声称胎儿的发育与种类物演变相似

Hematopoiesis of the other blood elements occurs in the fetal spleen
其他血液成分的生成发生在胎儿脾脏。

In the mid-1950s it was found that fetal cells in the amniotic fluid could be used to determine fetal sex and blood type
在50年代中，人们发现羊水中的胎儿细胞能用来确定性别和血型。

Fetal sentience is the capacity of the fetus to experience painful or unpleasant sensation .
胎儿感觉是指胎儿感受疼痛或不愉快感觉的能力。

There is at present uncertainty regarding the hazard to health presented by crocidolite.
目前，青石棉对健康的危害尚不清楚。

Some diseases are presented by heredity.
有些疾病是由于遗传导致的。

should alternately present as undulate .
激情平淡应呈波浪形交替出现。

A verb form in the present tense.
现在时态的动词形式

give away; make a present of
赠送