Phase of Yanshan

例句：

1. 1. The research was divided into three phases.
   这项研究被分为三个阶段。
2. 2. The project is in its second phase now.
   项目现在正处于第二阶段。
3. 3. He went through several phases of life before reaching adulthood.
   在他成年之前，他经历了几个人生的阶段。