nidus

例句：

1. 1. The nidus of the new project is still being developed.
   新项目的雏形仍在发展中。
2. 2. The discovery of the nidus of the planet was a major breakthrough.
   行星核心的发现是一次重大突破。
3. 3. The study of the nidus of the universe is still ongoing.
   对宇宙核心的研究仍在进行中。