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 ...
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...
It recycles drug money into more respectable enterprises.贩毒赚来的钱被转用来办一些较为正派的企业.It is how the cell degrades and recycles material into amino reused.这是细胞如何退化和回收利用原料合成氨基酸.It retained 50 % of its ini - tial activity after 50 ...
他们变得痴迷于给自己的车辆装备小配件，以应付可能出现的各种紧急情况。They become obsessed with trying to equip their vehicles with gadgets to deal with every possible contingency.当然. 设想是房屋不再充满小配件.Certainly. The idea is not to have a house full of gadgets....