几十年来，赛璐璐一直在商业上充当龟甲、角、骨和其他材料的代用品。
Celluloid had been commercially available for decades as a substitute for tortoise-shell, horn, bone and other materials.
赛璐璐胶片是个更大的问题，因为重做这东西更贵，也更花时间。
Cels are more of a problem because they are more expensive to retake and take more time to produce.
赛璐璐胶片是个更大的问题，因为重做这东西更贵，也更花时间。
Cels are more of a problem because they are more expensive to retake and take more time to produce.
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