A film of powder, liquid, or oil is a very thin layer of it.
薄层 • The sea is coated with a film of raw sewage. 海上覆盖着薄薄一层未经处理的污水。
If you film something, you use a camera to take moving pictures which can be shown on a screen or on television.
把…拍摄成影片 • He had filmed her life story. 他已经把她的人生故事拍成了电影。