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芝麻都快没人种了，为什么非洲人却大量种植？他们有什么用处？
非洲人简直太奇怪了，别的国家已经很少有人种植芝麻了，他们却大量种植。非洲人为什么要大量种植芝麻呢？他们要那么多芝麻，到底有什么用处？
不可思议的科普49/71
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