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This method of manufacture evolved out of a long process of trial.
这种制造方法是在长期试验过程中逐步形成的。
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
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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