停点或钢丝绳打滑，不丢失轿厢位置。
No loss of car position during longer power failure or rope slipping.
采用空气阻尼、停点迅速。
本文给出了强停点的一个等价定义，得出了两参数鞅关于强停点的停止定理。
In this paper, We give a equal definition of strong stopping point, and obtain a stopping theorem for two-parameter martingales to strong stopping point.
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