mature phase

例句：

1. 1.The mature phase of a tree is when it produces fruit.
   树木的成熟期是它产生果实的时候。
2. 2. In the mature phase, the company's profits increased significantly.
   在成熟阶段，公司的盈利显著增加。
3. 3. The mature phase of a project is often marked by significant progress and achievements.
   项目成熟阶段通常标志着显著的进步和成就。