So researchers have been looking for a way to fight this—a way to keep the helpful effects of free radicals without allowing them to cause brain damage.

因此，研究人员一直在寻找一种解决该问题的方法，即保留自由基的有益作用，而又不让它们造成大脑损伤。

In a way this a long-due framework of how the downstream business will operate, has finally been worked out.

在某种程度上，这是一个长期的框架内，由于下游企业如何运作，终于完成。