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blowhole	a nostril in the top of the head of a whale, dolphin, or porpoise. The blowhole is used to breathe. [1/3 definitions]
dolphin	A dolphin is a mammal that looks similar to a large fish and lives in the water. Like all mammals, it breathes air. Dolphins have teeth and a mouth that looks similar to a bird's beak. Dolphins that we see at water parks or on TV are usually gray, but there are dolphins of other colors too. Most kinds of dolphins live in the ocean.
porpoise	A porpoise is a mammal that lives in the ocean. Porpoises look similar to fish, but they breathe air. Porpoises are close relatives of dolphins. In North America, people often use the word "dolphin" for "porpoise."
whale¹	a very large mammal that lives in the water. Most kinds of whales live in the ocean. They have a body shaped like a dolphin or porpoise, flippers for front limbs, and a flat, triangular tail. Some kinds of whales have teeth; others feed with baleen. [1/2 definitions]

BOB半岛

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