The document issued Tuesday places an almost complete ban on the ivory trade in the United States.
星期二（2月11日）颁布的这一禁令几乎全面禁止在美国境内进行象牙交易。
Later, ivory plant gradually replaced by plastic, because plastic lower production costs in addition to making some small souvenirs, plants ivory almost been forgotten, but now it slowly back.
后来植物象牙逐渐被塑料所取代，因为塑料制作成本更低。除了制作一些小纪念品外，植物象牙几乎被人们遗忘了。但现在它又慢慢地回来了。
Later, ivory plant gradually replaced by plastic, because plastic lower production costs in addition to making some small souvenirs, plants ivory almost been forgotten, but now it slowly back.
后来植物象牙逐渐被塑料所取代，因为塑料制作成本更低。除了制作一些小纪念品外，植物象牙几乎被人们遗忘了。但现在它又慢慢地回来了。
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