semilethal mutant

例句：

1. 1. The study of semilethal mutants has led to significantadvancements in genetic engineering.
   对半致死突变体的研究已经导致了遗传工程的重大进步。
2. 2.The researchers discovered a new type of semilethal mutant that could potentially cure cancer.
   研究人员发现了一种可能治愈癌症的新类型的半致死突变体。
3. 3. The scientists are working ondeveloping a vaccine for the semilethalmutant strain of influenza virus.
   科学家们正在研究开发针对流感病毒的半致死突变株的疫苗。