aperture and stops

例句：

1. 1. The camera has a small aperture that allows it to focus on distant objects.
   这台相机有一个小孔，可以聚焦远处的物体。
2. 2.The scientist used apertures to control the amount of light entering the experiment.
   科学家使用孔来控制进入实验的光量。
3. 3.The artist painted a large aperture in the center of the canvas.
   艺术家在画布的中心画了一个大孔洞。