There's no instant way of finding a cure - it's just a process of trial and error . 找到治疗方案不可能一蹴而就——这只能是一个反复试验的过程。 If nothing is known about the variance of the data to be approximated, the smoothing factor must be determined by trial and error . 来自 Cambridge English Corpus This trial and error approach, where patients often do not display a full therapeutic response until several weeks after initiation, is unfavorable. 来自 Cambridge English Corpus The companies had to find out by trial and error what types of music would be attractive to customers. 来自 Cambridge English Corpus It is agreed that the work is of an experimental nature, with trial and error inherent and a high degree of risk accepted. 来自 Cambridge English Corpus For these children, offending may be considered as part of the context of child development in which youngsters learn prosocial behaviors by trial and error . 来自 Cambridge English Corpus Unfortunately, some additional trial and error is usually required before sensible bounds are found. 来自 Cambridge English Corpus

scientific methods of solving crimes, that involve examining objects or substances related to a crime