（二）在铁路、城市轨道交通线路上放置障碍物，或者故意向列车投掷物品的；
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* 1. 转换视角：将"追车"问题转为"到达时间"比较（后车时间≤前车 → 合并）；
One striking characteristic of Gelidium is that it must be wild-harvested rather than farmed. Unlike Gracilaria for culinary agar production, Gelidium grows slowly and thrives only in cold, turbulent waters over rocky seabeds, conditions nearly impossible to replicate in aquaculture. This dependence on wild harvesting explains the need for seaweed collectors during WWII, and continues to make Gelidium a strategically critical resource.