unfree variation

例句：

1. 1. The geneticists have discovered a new unfree variation of the virus.
   遗传学家们发现了病毒的一种新无自由变种。
2. 2. The scientists are studying the unfree variation of the disease.
   科学家们正在研究这种疾病的无自由变种。
3. 3. The unfree variation of the species has led to its extinction.
   物种的无自由变种导致了其灭绝。