前几天在阳台上闲站着，往楼下望去。不经意目睹两队人马，分别在河流两旁的运动跑道，往相反方向前进。乍看之下，以为是单人步行或健跑；细看之下才惊醒两边皆是双人行！
两方人马往相反方向前进，能碰面吗？难也，除非有一对来个180度的急转弯！
Chanced upon the above scenerio - two separate pair of individuals, moving forward in opposite direction, in parallel exercise paths separated by a river.
Will they ever meet up ? Not unless one pair decided to make a U-turn.
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