我们已经觉察到了问题的出现——把人的生长素基因转移到猪身上当然会促进猪的生长——但也会使他们得关节炎和斗鸡眼，这些是完全曾预料到的。

We are already seeing this problem―adding human growth hormone genes to pigs certainly makes them grow―but it also gives them arthritis and makes them cross-eyed, which was entirely unpredictable．

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