All those creatures, which are very interesting, in the end, you are told, "There's a horse inside a railway carriage."

所有有趣的生物,到最后都变成了,"在一节车厢里有一匹马"

耶鲁公开课 - 基础物理课程节选

If you're riding on a subway, a crowded train, and you wish to speak to your neighbor,

如果你正在乘地铁，车厢里很是拥挤，你想跟你的邻座说说话，

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For example, if you were in a crowded train, and another passenger is staring at you,

例如，你在一节拥挤的车厢里，有一个乘客老是盯着你，

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