Subway salmons refers to the one or two people who insist on going up a stairway or down a stairway ( usually after a train arrives at a subway stop) while all the people leaving the train are going in the opposite direction. Example:
地铁三文鱼指的是地铁站里(经常是地铁到站后人大量涌出时)坚持逆着人流上下楼梯的一两个人。
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