unfilled aperture

例句：

1. 1. The camera has an unfilled aperture that allows for more flexibility in shooting.
   这台相机有一个未填充的孔口，这使得拍摄更加灵活。
2. 2.The scientist used the unfilled aperture to study the behavior of the molecules.
   科学家利用未填充的孔口研究分子的行为。
3. 3.The engineer designed an unfilled aperture to improve the efficiency of the machine.
   工程师设计了一个未填充的孔口来提高机器的效率。