aperture opening ratio

例句：

1. 1. The camera has apertures on both sides.
   这台相机的两侧都有光圈。
2. 2. The scientist used aperture to control the amount of light entering the experiment.
   科学家使用光圈来控制进入实验的光量。
3. 3. The aperture is so small that it can only let a few drops pass through.
   这个孔很小，只能让几滴水滴通过。