a long spiral ivory tusk的用法和样例：
- small arctic whale the male having a long spiral ivory tusk.
- An Arctic whale(Monodon monoceros) that has a spotted pelt and is characterized in the male by a long spirally twisted ivory tusk projecting from the left side of its head.
- There was a long lag in forwarding mail to us.
- Fruit juices ferment if they are kept a long time.