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...
Oral contraceptives are readily available.口服避孕药容易得到.Some barrier contraceptives also help to protect against sexually transmitted infections.有些屏障避孕还有助于预防性传播疾病.Continuous Oral Contraceptives: Are Bleeding Patterns Depende...
The poll was widely discredited after allegations of ballot rigging.选举舞弊的指控出现后，这次投票测验受到了广泛质疑。Her honour was discredited in the newspapers.她的名声被报纸败坏了。The reactionary authorities are between two fires and have been discred...
底端的绶带上写着马尔代夫的传统名称.Ribbon at the bottom of the Maldives read the name of tradition.他身上挂满了领章、各种宝星勋章, 还挂着他的蓝绶带.He wore his collarand orders, and his blue ribbon as well.裁判举起霍梅尔斯的手宣告胜利, 霍梅尔斯戴上冠军绶带.The umpire raises Holmes�...