schlieren apparatus

例句：

1. 1. The scientist used a schlieren apparatus to study the flow of water in the river.
   科学家使用干涉仪研究河流中的水流。
2. 2. The schlieren apparatus was used to detect the presence of oil spills in the ocean.
   干涉仪被用来检测海洋中石油泄漏的存在。
3. 3. The schlieren apparatus helped scientists to understand the behavior of particles in the atmosphere.
   干涉仪帮助科学家们理解大气中粒子的行为。