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，这一点在电影中也有详细论述
Акция протеста прошла у посольства Украины в стране ЕС20:39
In the previous example we considered a space which has only one road looping back on itself. The number of times you would walk around the road to get back to the “same” point (or an equivalent point in a different copy) can be encoded using this “winding number” trick: