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...
Seamless pipe production process, there are two: Cross - rolling method ( Meng Mannesmann France ) and the extrusion method.无缝管的生产工艺有两种: 斜轧法 ( 孟内斯曼法 ) 和挤压法....
当生活很艰难，你想要放弃的时候，请记住，生活充满了起起落落，如果没有低谷，那站在高处也失去了意义。When life gets hard and you want to give up, remember that life is full of ups and downs, and without the downs, the ups would mean nothing.他们零星散居在安第斯山脉的高处。They live high ...
Of course, this interrupts the flow of thought and contact with hearers.这样当然会打乱思绪, 打断说话人和听众间的联系.He knew that his hearers wanted to hear this story...他知道自己的听众想听这个故事。The strange stories gripped the hearers'attention.这...
Most people lived in shacks and the Red Army was everywhere.绝大多数人住在小破屋里,红色军队到处都是.The other end of the road old shacks, he again fell asleep.在大路的另一头老人的窝棚里, 他又睡着了.Mounds of oyster shells surround the weathered shacks.成堆的牡蛎...
Recent advances in reproductive endocrinology are primarily due to the development of radioimmunoassay.最近取得的生殖内分秘研究成果,主要是由于放射免疫分析的进展.Pan Yunlong : Professor, Chief Physician And Director of Endocrinology Department , Spe...