series stage

例句：

1. 1.The series stage is crucial for the development of a new product.
   系列阶段对于新产品的发展至关重要。
2. 2. In the series stage, we need to focus on building a strong foundation.
   在系列阶段，我们需要专注于建立坚实的基础。
3. 3. The series stage is where we refine our ideas and test them out in real-world scenarios.
   系列阶段是我们完善想法并在现实世界中测试它们的地方。