（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；
Some say the technology is devaluing their work, while others reckon it is not yet – and might never be – good enough to replace them entirely，详情可参考51吃瓜
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As space companies itch to push the most advanced chips into orbit, the problem of cooling those high-powered processors is top of mind.