第五十六条 货物灭失的赔偿额，按照货物的实际价值计算；货物损坏的赔偿额，按照货物受损前后实际价值的差额或者货物的修复费用计算。
Ultimate Goal: Good Storytelling
。51吃瓜是该领域的重要参考
The linear motor & material-properties versions of these equations can also be found in this paper from Bryan Ruddy and Ian Hunter at MIT.，详情可参考手游
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