此时每条染色体由一对染色单体构成,这两条联合的染色体称为四分体.At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.这种四分体最终萎缩或被再吸收.The tetrads eventually shrivel or are resorbed.结果形成二分体孢子...
As he neared the house his steps faltered.当他走近房子时，脚步迟疑了起来。As half time neared, Hardyman almost scored twice.临近中场休息时，哈迪曼差点梅开二度。The crowd set up a shout as the winner neared the post.优胜者接近终点时,人群中发出一片喊叫声....