1. 轮子   tire pressure   inner tube   sprocket   wheel   Hint Half-n-half Clue   2. 脚蹬   pedal   sprocket   helmet   handbrake   Half-n-half Clue   3. 轮幅   spoke   handlebar   engine   valve   Half-n-half Clue   4. 泵浦   sprocket   pump   seat   helmet   Half-n-half Clue   5. 闸   chain   tire pressure   brake   lock   Half-n-half Clue   6. 位子   brake   seat   tire   wheel   Half-n-half Clue   7. 喇叭   exhaust pipe   wheel   horn   tricycle   Half-n-half Clue