1. 鎖   brake   exhaust pipe   lock   wheel   Hint Half-n-half Clue   2. 引擎   engine   pump   gear lever   tire   Half-n-half Clue   3. 泵浦   horn   tricycle   shock absorber   pump   Half-n-half Clue   4. 三輪車   seat   tricycle   inner tube   motorcycle   Half-n-half Clue   5. 扣練齒輪   seat   engine   tire pressure   sprocket   Half-n-half Clue   6. 手刹車   seat   pump   handbrake   motorcycle   Half-n-half Clue   7. 輪幅   motorcycle   spoke   pedal   seat   Half-n-half Clue