"We are able to demonstrate that the spread of malignant malaria happened only within the last five thousand years, even though the parasite affects hundreds of millions of people.

VOA: standard.2010.04.05

It was a gene that was causing a cell to be malignant and to divide without control, for example.

例如,一个会使细胞恶化,并不受控制地无限分裂的基因

耶鲁公开课 - 生物医学工程探索课程节选

It could be foreign because it's become malignant.

这种细胞可能是外源物,因为它已经具有了危害性

耶鲁公开课 - 生物医学工程探索课程节选