象牙是如何构造的?

大象的一个显着特征是它们的象牙。象牙是极度拉长的门牙,可以终身生长。 作者:zdf/Tango Film/Eva-Maria Gfirtner、Judith Adlhoch/Markus Strobel/Jan-Philipp Stahl/Magnet FX 翻译和配音:alugha 点击这里观看更多视频:https://alugha.com/TerraX

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