The viruses are very simple constructed compared to even a mycoplasma cell.即使与枝原体细胞相比,病毒的结构也是十分简单的.This applies to most respiratory infections ( e . g . mycoplasma infections, infectious coryza, laryngotracheitis ).大多数呼吸...
Many migratory birds visit this lake annually.许多候鸟每年到这个湖上作短期逗留.Cheniers have a parallel , gently arcuate alignment reflecting the migratory history of the shoreline.沙脊呈平行的 、 微弓形排列,这能反映滨线迁移的历史.The positive rate of migrato...