closed test section wind tunnel

例句：

1. 1. The closed testsection is crucial for testing the new engine design.
   封闭测试段对于测试新发动机设计至关重要。
2. 2. The engineers used the closed test section to simulate real-world conditions.
   工程师们使用封闭测试段来模拟真实世界的条件。
3. 3. The closed test section allowed us to gather data without disturbing the surrounding environment.
   封闭测试段使我们能够收集数据而不会干扰周围环境。