一脚蹬比系带鞋容易穿。Slip-on shoes are easier to put on than lace-ups.用镶边、系带和流苏装饰朴素的床罩和窗帘。Embellish basic covers and curtains with borders, ties and fringing.穿合脚的、系带的软帮鞋。Wear well-fitting, lace-up shoes with soft uppers....
At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.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.Microspore abortion occurred after the tetrad formation.小孢子败育发生在四分体形成以后...