a long process of trial and error
一个长期的试错过程
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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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。
This was a long process of trial and error, of putting together, and looking at backtesting.
FORBES: Use the RCI to Gauge Market Strength
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