鲸不仅仅是世界上最大的动物，它还是最聪明的动物之一。
The whale is not only the world's biggest animal, it is also one of the cleverest.
鲸鱼是地球上最大的动物，海豚是最聪明的动物之一，鲨鱼则是最危险的动物之一。
Whales are the largest animals on the Earth. Dolphins are one of the most intelligent animals. Sharks are one of the most dangerous animals.
但动物行为学家一直认为，乌鸦至少有一个优势：它是世界上最聪明的鸟之一。
But animal behaviorists have long believed that the crow has at least one thing in its favor.
但动物行为学家一直认为，乌鸦至少有一个优势：它是世界上最聪明的鸟之一。
But animal behaviorists have long believed that the crow has at least one thing in its favor.
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