The technique has been to mutate the genes by irradiation or chemicals.该技术是通过放射线照射或者使用化学方法使基因变异。A newer anti-HIV drug called pyridinone caused HIV to mutate into a form which could not reproduce or infect new cells.一种叫作吡...
For this peccadillo he was demoted and sent back to pound the beat.由于这次过失,他被降了级,又被打发去干徒步巡警了.They have been demoted to less responsible jobs.他们被降职去做不太重要的工作。He would be moved sideways, rather than demoted.他会被平级调动而不是降级。The ...