But that remains to be proved.

不过，这一理论还有待证实。

Firms believe they can charge high prices not only because of the costs of developing and making the drugs, but because they offer potentially lifelong benefits (although the durability of these treatments remains to be proved).

各公司认为， 他们可以收取高价， 不仅是因为开发和制造药物的成本，还因为这些药物可能带来终身受益（尽管这些治疗的持久性仍有待证明）。