angular aperture of human eye

例句：

1. 1.The camera has a large aperture that allows for clear photos.
   这台相机有一个大光圈，可以拍摄出清晰的照片。
2. 2.The scientist used a small aperture to observe the tiny insects.
   科学家使用一个小孔来观察这些微小的昆虫。
3. 3.The telescope had a very small aperture, which made it difficult to see the stars.
   这架望远镜非常小的孔径，这使得看星星变得很困难。