photo finish
noun [ C ] uk/ˌfəʊ.təʊ ˈfɪn.ɪʃ/ us/ˌfoʊ.t̬oʊ ˈfɪn.ɪʃ/
摄影定胜负（参赛者到达终点时非常接近，需借助照片来判定胜负）
the end of a race when the competitors are so close that a photograph has to be examined in order to discover who has won
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