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。
The example shows that the formula is more efficient than the trial and error method.
计算实例表明，用计量式计算比试差法更方便有效。
The process parameters were usually determined in production by trial and error method.
筒形件强力旋压中各工艺参数在生产中常用试旋的方法确定。
The process parameters were usually determined in production by trial and error method.
筒形件强力旋压中各工艺参数在生产中常用试旋的方法确定。
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