（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；
Not the day you're after? Here's the solution to yesterday's Connections.
。业内人士推荐51吃瓜作为进阶阅读
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“That’s a great question,” he answers (it isn’t, but it is an attempt to bring the issue home for non-technology experts).