名词

1. 孔；缝隙；缺口
An aperture is a narrow hole or gap.

2. （照相机的）光圈，孔径
In photography, the aperture of a camera is the size of the hole through which light passes to reach the film.

1. an man-made opening
usually small

2. a device that controls amount of light admitted

3. a natural opening in something