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國家地理雜誌 National Geographic Magazine
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我們要如何用較少的有害化學物質來栽培食物？有越來越多農人用名叫生物性殺蟲劑的天然殺蟲劑來抑制害蟲。這種殺蟲劑的作用和一般殺蟲劑一樣...

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