以前没有需求，所以一切研究停留在实验室阶段。

There was no demand before, so all the research stayed in the laboratory.

youdao

以前没有需求，所以一切研究停留在实验室阶段。

Before, there was no demand so all the research was in the laboratory.

youdao

以前没有需求，所以一切研究停留在实验室阶段。

Before, there was no demand so all the research was in the laboratory.

youdao