Scientists are studying a deadly virus as a way to kill rabbits, and have embarked on long-term research into genetically engineered viruses that would make rabbits and foxes sterile.

• 科学家正在研究一种致命的病毒，作为杀死兔子的一种方法； 而且已经着手长期研究用遗传工程技术制造转基因病毒，使兔子和狐狸失去生殖能力。