Elephant tusks are ivory teeth that grow throughout the animals' lives.

象牙的生长贯穿于象的全部生命。

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The tusks of an elephant are actually its front teeth.

象的长牙实际上就是它的门牙。

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Throughout the Nomenclature, elephant, hippopotamus, walrus, narwhal and wild boar tusks, rhinoceros horns and the teeth of all animals are regarded as "ivory".

本税则所称“兽牙”，是指象、河马、海象、一角鲸和野猪的长牙、犀角及其他动物的牙齿。

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"I meant what I said and I said what I meant, " the devoted elephant explains through chattering teeth and all sorts of weather, "An elephant's faithful one hundred per cent!"

WSJ: Parsing the Fun in Life