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。
They needed a stronger crystal, but the process of trial and error takes a long time.
他们需要一个更强的晶体，但是试错的过程耗费了他们很长的一段时间。
They needed a stronger crystal, but the process of trial and error takes a long time.
他们需要一个更强的晶体，但是试错的过程耗费了他们很长的一段时间。
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