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。
Once we get down to the oil, it usually flows to the surface because great pressure,
一旦到达油层,石油就会由于地下巨大的压力流到地面上来,