象牙的英语是 ivory。以下是一些关于象牙的英语例句，供您参考：

1. She wore a necklace made of ivory.

2. The elephant's tusks are made of ivory.

3. In the new year, China will ban the ivory trade.

4. Many people believe that the trade of ivory should be banned.

5. Ivory is a white hard object that is mainly composed of dentin, similar to the composition of bones.

6. The color of ivory is a milky white, which is a bit yellowish compared to pure white.

希望这些信息对您有所帮助。