And if there was a 3D showing in the theater before a standard 2D showing, a lens meant only for 3D movies may still be on the projector, making the image two-thirds darker than it should be.
如果一場 2D 電影前已放映了一場 3D 電影,3D 專用的鏡頭可能仍在機器上,使影像比原本應有的亮度暗了三分之二倍。