Celluloid had been commercially available for decades as a substitute for tortoise-shell, horn, bone and other materials.
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.
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。
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