Schlieren projection lens

例句：

1. 1.The Schlieren projection lens is used to create a clear image of the object being observed.
   折射投影透镜用于创建被观察物体的清晰图像。
2. 2. The Schlieren projection lens is an essential tool for scientists in their experiments.
   折射投影透镜是科学家实验中不可或缺的工具。
3. 3. The Schlieren projection lens was developed by a team of experts who were dedicated to improving optical imaging technology.
   折射投影透镜是由一支致力于提高光学成像技术的专家团队开发的。