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。
Since the ban, the horn of water buffalo has been used as a substitute, but it is not considered as effective.
由于禁令的出台，人们只得退而求其次，选择水牛角作为犀角的替代品，但是它被认为没有犀角那么有效。
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