分类学上的种是根据表型不连续性而不是根据互交可孕性来确定的.Taxonomic species are defined on phenetic discontinuities, not on interfertility.把无融合生殖小种 ( 无性种 ) 作为分类学上的种来承认,这点具有更大的迷惑性.The temptation to recognize apomictic microspecies ( agamospecies ) a...
When a woman is in labour, her cervix opens up to allow the baby to be born.当妇女分娩时, 子宫颈张开让婴儿生出来.The cervix is the flexib 1 e region between the head and prothorax.颈是头部和前胸之间可曲的区域.Here is a normal cervix with a smooth, gli...
The private sector, by contrast, has plenty of money to spend.相比之下，私营部门就有很多钱可供开销。Hungary, by contrast, reacted calmly to events in Yugoslavia.相比之下,匈牙利对南斯拉夫发生的一系列事件反应平静.By contrast, the comparable figure for the Netherlan...