「Perfect as is the wing of a bird, it never could raise the bird up without resting on air. Facts are the air of a scientist. Without them you can never fly. Without them your theories are vain efforts.」- 巴甫洛夫经典语录
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Perfect as is the wing of a bird, it never could raise the bird up without resting on air. Facts are the air of a scientist. Without them you can never fly. Without them your theories are vain efforts.
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