非洲书面文学的大量产生发生在20世纪。
A large number of African written literatures have occurred in the 20th century.
在胶片上产生影像的光在通过乳剂时发散，或在乳剂和片基表面发生发射。
Light forming an image on the film is scattered by passing through the emulsion or by reflection at the emulsion or base surfaces.
在胶片上产生影像的光在通过乳剂时发散，或在乳剂和片基表面发生发射。
Light forming an image on the film is scattered by passing through the emulsion or by reflection at the emulsion or base surfaces.
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