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。
Their humbler followers, such as partridges, have a like power of strong propulsion, but soon tire.
次于野鸭和鸽子的鸟,如鹧鸪,有相似的巨大推动力,但很快会疲劳。