aperture card

例句：

1. 1.The aperture card is used to filter out small particles from the air.
   孔板卡用于过滤空气中的小颗粒。
2. 2. The aperture card is essential for maintaining proper airflow in the ventilation system.
   孔板卡对于保持通风系统内的空气流通至关重要。
3. 3.The aperture card was designed to improve the efficiency of the filtration process.
   孔板卡的设计旨在提高过滤过程的效率。