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並前往https://www.cnn.com/2020/03/18/world/how-narwhal-got-its-tusk-scn-trnd/index.html

We finally know why narwals have tusks (Hint: It has to do with ...

Narwhals are known as the "unicorns of the sea," but the reason for the whales' showy tusks has long mystified scientists.

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