现行的相关法律颁布于1967年，规定只有在胎儿能成型存活，相当于28周孕期以后才可以终止妊娠。
The current law, passed in 1967, permitted abortion only until a fetus was "viable", which was assumed to be at 28 weeks.
"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."
他找到了138例这样的双胞胎妊娠记录：一个胎儿在妊娠16周内死亡，另一个出生并存活下来。
He found 138 instances in which one twin died before 16 weeks' gestation and the other was born and survived.
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