aperture correlation function

例句：

1. 1. The camera has an aperture of f/2.8.
   这台相机的光圈为f/2.8。
2. 2. The scientist used apertures to study the behavior of the animals.
   科学家使用开口来研究动物的行为。
3. 3.The aperture of the telescope is large enough to observe distant stars.
   望远镜的开口足够大，可以观察远处的星星。