1. 淡菜   mussel   seal   whale   crab   Hint Half-n-half Clue   2. 蝸牛   jellyfish   seal   snail   otter   Half-n-half Clue   3. 龍蝦   seal   shrimp   lobster   dolphin   Half-n-half Clue   4. 蝦   otter   starfish   seal   shrimp   Half-n-half Clue   5. 海膽   lobster   shark   clam   sea urchin   Half-n-half Clue   6. 箭魚   octopus   swordfish   seal   crab   Half-n-half Clue   7. 海牛   manatee   whale   eel   starfish   Half-n-half Clue