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 was officially opened on March 7,1994, finally connecting Britain to the European continent.
它于1994年3月7日正式开通,将英国与欧洲大陆连到了一起。