1. 泵浦   tricycle   lock   pedal   pump   Hint Half-n-half Clue   2. 盔甲   helmet   shock absorber   motorcycle   spoke   Half-n-half Clue   3. 缓冲器   helmet   shock absorber   brake   lock   Half-n-half Clue   4. 脚蹬   wheel   chain   pedal   motorcycle   Half-n-half Clue   5. 轮子   wheel   sprocket   exhaust pipe   tire pressure   Half-n-half Clue   6. 三轮车   helmet   exhaust pipe   tricycle   engine   Half-n-half Clue   7. 滑行车   helmet   engine   wheel   scooter   Half-n-half Clue