undisclosed partner

例句：

1. 1. The company's financial results were not disclosed until the end of the year.
   该公司的财务结果直到年底才披露。
2. 2. The project is still in an undisclosed phase.
   该项目仍处于一个未公开的阶段。
3. 3. The details of the new product were kept undisclosed until the launch.
   新产品的细节在发布前一直保持保密。