variable focal length lens造句

例句与造句

1. The total amount of light reaching the film plane ( the'exposure') changes with the duration of exposure, aperture of the lens, and on the effective focal length of the lens ( which in variable focal length lenses, can force a change in aperture as the lens is zoomed ).
2. It's difficult to find variable focal length lens in a sentence. 用variable focal length lens造句挺难的