Sarah lined up next to other girls missing limbs.
莎拉排队四肢旁边其他女孩失踪。
Lots of people face far more significant limitations than you do. They may be missing limbs or are born into extreme poverty.
很多人面对着更巨大的局限,他们可能失去了四肢或者出生在异常贫穷的家庭里。
Shrunken limbs and missing digits are likely due to changes in the Hox genes, which determine the development of lower body segments.
缩小的肢体和消失的趾头很可能是由于基因的变化而造成的,这决定了下肢的演化过程。
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