双秒针凸轮驱动跳杆的英文

split-second cam driver jumper

• 双:    two; twin; both; d ...
• 秒针:    second hand
• 凸轮:    cam
• 驱动:    drive; prime mover
• 跳:    jump; leap; skip; ...
• 杆:    shaft; rod; bar