1. 沙子   sand castle   wave   sand   swimming trunks   Hint Half-n-half Clue   2. 毛巾   sea   towel   swimsuit   shovel   Half-n-half Clue   3. 波浪   sea   surfboard   swimsuit   wave   Half-n-half Clue   4. 救生衣   swimsuit   sand castle   lifejacket   swim   Half-n-half Clue   5. 救生员   sand castle   lifeguard   sea gull   shovel   Half-n-half Clue   6. 桶   lifejacket   pail   shore   swimsuit   Half-n-half Clue   7. 壳   surfboard   shell   shovel   sea   Half-n-half Clue