1. Historians have long been puzzled by dots, lines and symbols which have been engraved on walls, bones, and the ivory tusks of mammoths. 
   刻在墙壁、甲骨和长毛象的牙齿上的点、线和符号，长久以来使得史学家迷惑不解。
2. A substance resembling ivory. 
   仿象牙品类似象牙的物品
3. inscriptions on oracle bones 
   甲骨文
4. Oracle Bones at Zhouyuan 
   周原甲骨
5. An article made of ivory. 
   象牙雕象牙制的艺术品

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