He cannot prevent the reader from preferring Ethan Brand to the cloddish villagers of the tale.读者还是喜欢伊桑?布兰德而讨厌故事里那些土头土脑的乡民. 这他是阻止不了的.He is a real rustic . However fashionable his clothes always looks cloddish.他就是俗气, 无论穿多...
种间杂交的主要障碍是F1代的不育性.A major barrier to interspecific hybridization is sterility in the F 1 progeny.因此,向日葵细胞质雄性不育性的研究备受关注.That is why cytoplasmic male sterility ( CMS ) in sunflower is the research focus through years....