A tusk is one of a pair of very long, pointed teeth that grow out past an animal's mouth and stay visible all the time — elephants have them, and so do walruses, wild boars, warthogs and narwhals. The key idea is that a tusk is a real tooth, not a horn: horns grow from the head, tusks grow from the jaw.

A tusktusk is one of a pair of very long, pointed teeth是一對非常長、尖尖的牙齒中的一根 that grow out past an animal's mouth and stay visible all the time會從動物的嘴巴外面長出來，而且一直露在外面 — elephants have them, and so do walruses, wild boars, warthogs and narwhals大象有，海象、山豬、疣豬和獨角鯨也都有. The key idea is that a tusk is a real tooth, not a horn重點是tusk是真正的牙齒，不是角: horns grow from the head, tusks grow from the jaw角是從頭上長出來的，tusk是從下顎長出來的。

That is why the word matters so much in news about wildlife, where elephants are killed for the ivory in their tusks.

That is why the word matters so much in news about wildlife這也是為什麼這個字在野生動物新聞裡這麼重要, where elephants are killed for the ivory in their tusks因為大象會因為tusk裡的象牙而被獵殺。

It is a countable noun, and because they usually come in twos you will often see the plural: 'its tusks', 'a pair of tusks'. There is also a rarer verb 'to tusk', meaning to dig or stab something with tusks, which you will mostly meet in nature writing rather than conversation.

It is a countable noun它是可數名詞, and because they usually come in twos you will often see the plural因為通常是成對出現，你會常看到複數形式: 'its tusks', 'a pair of tusks''its tusks'、'a pair of tusks'. There is also a rarer verb 'to tusk'也有一個較少見的動詞'to tusk', meaning to dig or stab something with tusks意思是用tusk去挖或刺東西, which you will mostly meet in nature writing rather than conversation這個用法你大多會在自然寫作裡遇到，而不是在對話裡。