phase portrait

例句：

1. 1. The scientist has been working on the project for several years now.
   这位科学家已经在这个项目中工作了好几年。
2. 2. The company is in a phase of rapid growth.
   这家公司正处于快速发展的阶段。
3. 3.During this phase, we need to focus on improving our skills and teamwork.
   在这个阶段，我们需要专注于提高我们的技能和团队合作。