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。
Normal people tend to forget this process unless and until they are reminded of it.
衰老的过程,不经提起,正常人容易忘记;一经提醒,才会记起。