Orthochromatic film (Ortho film): Photographic material insensitive to red lihgt but sensitive to green and vlue lights.It is the standard type of phototypesetting film and origination film.是什么意思_Orthochromatic film (Ortho film): Photographic material insensitive to red lihgt but sensitive to green and vlue lights.It is the standard type of phototypesetting film and origination film.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句