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...
She had a strong desire to be a dancer but failed to make the grade.她非常渴望成为舞蹈演员，但却因为达不到标准而未能圆梦。They may pull all their lives and never make the grade, not even in this trade.他们也许拉一辈子洋车,而一辈子连拉车也没出过风头.It takes hard work to...