1.The policy optimization problems in a system dynamics model, however, still follow the " cut-and-try " method, which does not work well.
但系统动力学的政策优化问题还是沿用“试凑法”，一直没能得到很好的解决。
2.The performance of regulator is obtained by making of a number of experiments with the help of cut and try method.
调速器的工作特性性能及结构参数通常是用试凑方法，通过诸多试验得到。