Film: Photosensitive material,generally on a transparent base.Based on different speed of light sensitivity and colour sensitivity,there are many different grade of films for different purposes.是什么意思_Film: Photosensitive material,generally on a transparent base.Based on different speed of light sensitivity and colour sensitivity,there are many different grade of films for different purposes.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句