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谁发现了第一个土豆? 我们不知道谁把野生植物培育成作物供人们种植,但是我们相当清楚这些人是在哪发现这些植物的,这些植物又是如何传遍世界的。例如:
Who discovered the first potato? We don't know who made the wild plants into crops for people to plant, but we know quite well where these people found these plants and how these plants spread throughout the world. E.g: