有的人行程长，有的人行程短。
Some people have longer journeys, while others have shorter ones.
制动气室推杆行程短，制动迅速有效。
The stroke of push rod is shorter to ensure a rapid and effective braking.
结构紧凑， 变焦行程短， 变焦轨迹平滑， 像面稳定。
The structure is compact, zoom distance is short and zoom track is smoothness, The image plane is tranquilization.
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