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They are the result of a long process of trial and error.
它们是不断的尝试和失败之后的结果。
youdao
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This method of manufacture evolved out of a long process of trial and error.
这种生产方法是经过长期的试验和失败获得的。
youdao
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This method of manufacture evolved out of a long process of trial and error.
这种生产方法是经过长期的试验和失败获得的。
youdao