stage theory

例句：

1. 1. The play went through several stagesbefore it was finally performed.
   这部戏剧在经过几个阶段后最终上演。
2. 2. The companyis in a transitional stage between twomajor projects.
   该公司正处于两个重大项目之间的过渡期。
3. 3. The artist's career has gonethrough several stages of success and failure.
   这位艺术家的职业生涯经历了多次成功与失败的阶段。