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一叶知秋(一葉知秋)
◎ 一叶知秋 yīyè-zhīqiū
[The fall of a single leaf ushers in the autumn;One falling leaf is indication of autumn] 看见一片落叶,就知道秋天将临。比喻发现一点预兆就知道事物将来的发展趋向