preliminary mine design

例句：

1. 1. The project is inthe preliminary stages of development.
   该项目处于开发初期阶段。
2. 2. The team has completed the preliminarywork for the new project.
   团队已经完成了新项目的初步工作。
3. 3. The preliminary results arepromising, but further analysis is needed.
   初步结果令人鼓舞，但需要进一步分析。