the theory of natural selection, first propounded by Charles Darwin查尔斯∙达尔文首先提出的物竞天择理论Natural selection ensures only the fittest survive to pass their genes on to the next generation.自然选择确保只有最适应环境的物种得以存活下来，把基因传给下一代。All ba...
Intermontane basins in relatively stable regions subjected to regional uplift.较稳定区域内的山间盆地,曾有过区域隆起.The Longchuanjiang basin belongs to a small intermontane continental sedimentary basin in orogenic zone in Cenozoic.龙川江盆地是...
The auction was the liveliest part of the entertainment.拍卖场是最热闹的娱乐场所.an auction of cricket memorabilia板球收藏品拍卖They've put the contents of their house up for auction.他们把房子里的东西全都拿去拍卖了。Trading was very light ahead of ye...
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...