1. 踏み板   pedal   exhaust pipe   cable   tricycle   Hint Half-n-half Clue   2. 三輪車   cable   chain   sprocket   tricycle   Half-n-half Clue   3. 非常ブレーキ   sprocket   tire pressure   handbrake   wheel   Half-n-half Clue   4. 安全帽子   wheel   helmet   gear lever   lock   Half-n-half Clue   5. 鎖   seat   pedal   helmet   chain   Half-n-half Clue   6. 排気管   gear lever   wheel   exhaust pipe   sprocket   Half-n-half Clue   7. 車輪   tricycle   wheel   handbrake   tire pressure   Half-n-half Clue