With a shortage of chromosomes, a developing fetus will likely grow into a child with down syndrome.
如果缺省染色体,一个处于成长阶段的胚胎可能发育成一个具有不良综合症的小孩。
(A light year is the distance which light travels at 186,000 miles per second in one year,
一光年是光以每秒186,000英里的速度在一年内走的距离,