stellar birthrate

例句：

1. 1. Thestar's birthrate is a keyfactor in its life cycle.
   这颗星的诞生率是其生命周期的关键因素。
2. 2. The studyof stellar birthrates has led tonew discoveries about the universe.
   研究恒星诞生率已经导致了关于宇宙的新发现。
3. 3. Thestar's birthrate is closely relatedto its mass and age.
   这颗星的诞生率与其质量、年龄密切相关。