1. 轮幅   seat   wheel   spoke   helmet   Hint Half-n-half Clue   2. 缓冲器   brake   pump   shock absorber   tire   Half-n-half Clue   3. 扣练齿轮   helmet   engine   sprocket   cable   Half-n-half Clue   4. 喇叭   chain   tricycle   horn   sprocket   Half-n-half Clue   5. 轮胎气压   seat   handbrake   lock   tire pressure   Half-n-half Clue   6. 锁   horn   gear lever   helmet   lock   Half-n-half Clue   7. 位子   tricycle   seat   pump   lock   Half-n-half Clue