Stage of Yanshan

例句：

1. 1. The play has three main stages.
   这出戏有三个主要阶段。
2. 2. He is in the middle stage of his career.
   他正处于职业生涯的中期。
3. 3. The new project will have several stages of development.
   这个新项目将经历几个发展阶段。