One of the most vexing problems in hiv research is the virus 's extreme mutability .

hiv研究过程中最棘手的麻烦之一，是这种病毒极其强大的变异能力。

But the fact is , mutability lies in the notion of existence , and change is only the manifestation of what it implicitly is .

但事实上，变化即包含在定在的概念自身之内，而变化只不过是定在的潜在本性的表现罢了。