Frame Line Marking: A mark placed on the edge of the film between every fourth perforation as an aid to splicing in frame when no image or frame line is visible.是什么意思_Frame Line Marking: A mark placed on the edge of the film between every fourth perforation as an aid to splicing in frame when no image or frame line is visible.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句