1. 游艇   yacht   jet plane   motorboat   streetcar, tram   Hint Half-n-half Clue   2. 风船   subway   sailboat   scooter   streetcar, tram   Half-n-half Clue   3. 独木舟   kayak   jet plane   canoe   yacht   Half-n-half Clue   4. 单轨铁路车   jet plane   monorail   raft   streetcar, tram   Half-n-half Clue   5. 路面电车，电车   raft   streetcar, tram   pickup truck, pick-up van   kayak   Half-n-half Clue   6. 滑行车   monorail   scooter   breakdown van, tow-truck   glider   Half-n-half Clue   7. 木筏   raft   cruiser   subway   canoe   Half-n-half Clue