"prematurely"是副词，意思是"未成熟地，太早地，早熟地"。 本句应译为：如果一个婴儿早产并存活，那么合适的称呼应该是早产婴或者早产宝宝，而非胎儿。

If an infant is born alive ...or "premature baby," not "fetus."

youdao

另外这个胎儿的发育阶段暗示了他处在3分之2成熟阶段.

The fetus’s level of development indicates that it was at most two-thirds mature.

youdao

胎儿的成型程度表明它最多只有三分之二成熟。

The fetus's level of development indicates that it was at most two-thirds mature.

youdao

由于妊娠中期的胎儿极不成熟，往往很快死亡。

Because of the fetal very mature gestation, often soon die.

youdao

由于妊娠中期的胎儿极不成熟，往往很快死亡。

Because of the fetal very mature gestation, often soon die.

youdao