fetus['fitəs]: n. 胎儿，胎

Although we’ve never had a human birth in space before, we do have some experiments conducted on rats, fish, lizards and invertebrates. In the 1990s, rats gave birth on a US space shuttle mission, and every pup was born with an underdeveloped vestibular system, the inner-ear structure that allows mammals to balance and orient themselves. They recovered their sense of balance shortly after, but the scientists concluded that infants need gravity.

虽然还没有人在太空分娩过，不过，我们已经用老鼠、鱼、蜥蜴和无脊椎动物做过试验。上世纪90年代，一只老鼠曾在美国的一次航天任务中产仔，生出的每只小老鼠前庭系统都发育不良。前庭系统是让哺乳动物自我平衡和导向的内耳结构。尽管这些小老鼠不久后就恢复了平衡感，但科学家得出结论说，幼崽的出生需要重力。

invertebrate[ɪn'vɝtɪbret]: n. 无脊椎动物

vestibular system: 前庭系统

The absence of gravity would pose serious problems, like the lack of assistance when the mother pushes the baby out, the difficulty of administering a pain-numbing epidural with the patient flowing through space, or bodily fluids floating through the shuttle as blobs.

没有重力会产生多个严重问题，比如，母亲用力娩出婴儿时会缺少助力，产妇在太空中漂浮时也将难以注射硬膜外麻醉剂，还有体液将会一团团地漂浮在飞船中。

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