然而，目前免疫疗法还处于试验阶段。

For the time being, however, immunotherapy is still in its experimental stages.

《柯林斯英汉双解大词典》

这种设备仍处于试验阶段。

The equipment is still at the experimental stage.

《牛津词典》

这是因为第五代网络仍处于测试和试验阶段。

This is because fifth generation networks are still in testing and trial phases.

youdao

Another approach which is still investigational, in that it's being tried for many diseases but not yet clinically used in any particular one, is maybe you don't need to introduce a whole virus or pieces of a protein at all.

另一种方法目前仍处于试验阶段,该方法即将试用于许多疾病,但还没有对某一特定疾病进行临床试验,那就是无需引入整个病毒,或者根本不用引入蛋白质片段

耶鲁公开课 - 生物医学工程探索课程节选