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- Bicycle Trivia (6) - Only inlet and not exhale the valve core and epilogue
- Bicycle Trivia (5) -The reason why the inverted pedal wheels will not turn back
- Bicycle Trivia (4) -The chain drive of the bicycle and its transmission principle
- Bicycle Trivia (3) - Flywheel
- Bicycle Trivia (2) - Small steel balls have a big role
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