As films are sensitive to light,they can only be processed in darkness.
问题描述：
As films are sensitive to light,they can only be processed in darkness.
答
因为胶片对光线敏感，洗胶片只能在黑暗中进行
答
正因为胶片对于光线很敏感，所以它们只能在黑暗中曝光。
答
由于胶片感光,所以只能在黑暗中冲洗他们.