The equipment is still at the experimental stage.

这种设备仍处于试验阶段。

《牛津词典》

A second technique relies on magnetic fields. It is still at an experimental stage and works using resonance.

第二类技术以磁场为依托，利用共振原理，目前仍处于研究阶段。

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While this project is very much in the experimental stage, it provides a glimpse of what transportation might look like in the future thanks to advanced computer science.

然而该项目目前尚处于试验阶段，借助于先进的计算机技术，我们窥见了未来交通的端倪。

youdao

The new method is promising, he said, but it is still at an experimental stage.

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Time will tell whether they can take OneID beyond the experimental stage and turn it into a significant enterprise.

FORBES: Vinod Khosla Bets Millions on One Digital Identity

Lots of people have volunteered for the service's experimental stage, so Google is expected to make it more widely available soon.

ECONOMIST: Now they have assumed power, what will consumers do with it?