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。
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。
It was a long process of trial and error with the collaboration of factories.
这是一个不断试验的过程,当然也不可避免不断犯错误,这需要工厂和我们的通力合作。
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