1. 鲨鱼   shark   sea urchin   jellyfish   eel   Hint Half-n-half Clue   2. 淡菜   sea urchin   dolphin   seal   mussel   Half-n-half Clue   3. 封印   mussel   shark   otter   seal   Half-n-half Clue   4. 章鱼   otter   snail   swordfish   octopus   Half-n-half Clue   5. 鳗鱼   eel   jellyfish   otter   turtle   Half-n-half Clue   6. 水獭   jellyfish   eel   dolphin   otter   Half-n-half Clue   7. 海牛   eel   manatee   dolphin   sea urchin   Half-n-half Clue