1. 排气管   sprocket   exhaust pipe   valve   chain   Hint Half-n-half Clue   2. 摩托车   motorcycle   sprocket   tire   shock absorber   Half-n-half Clue   3. 闸   brake   horn   spoke   handbrake   Half-n-half Clue   4. 缆绳   cable   spoke   sprocket   wheel   Half-n-half Clue   5. 缓冲器   shock absorber   chain   helmet   pump   Half-n-half Clue   6. 喇叭   tire pressure   tricycle   wheel   horn   Half-n-half Clue   7. 泵浦   pump   handbrake   sprocket   seat   Half-n-half Clue