flipper: (海豹、企鵝等海洋生物用來游泳的）鰭肢，鰭足, 阔鳍，
Whales , seals , penguins , and turtles have flippers.
fin: 鰭；（飛機的）翼（片）；鰭狀物
We could see the fin of a shark as it slowly circled our boat.
flipper: (海豹、企鵝等海洋生物用來游泳的）鰭肢，鰭足, 阔鳍，
Whales , seals , penguins , and turtles have flippers.
fin: 鰭；（飛機的）翼（片）；鰭狀物
We could see the fin of a shark as it slowly circled our boat.
