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。
It later became apparent that rabbits were developing a degree of resistance to this disease,
后来,明显看出,兔子对这种疾病已产生了一定程度的免疫力,