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“觀察必須有固定的對象和確切的目的,不能聽憑興之所至亂觀亂察。天文學家觀察星球,植物學家則觀察草木的生長。後來我又發現另外一種稱為實驗的受控制的觀察,科學發現就是由實驗而來的。”

Anonymous
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