The simulation model for landing process of a helicopter with rotator self-rotating is built with the proposed method. The whole model and modeltuning method are also given.
应用该方法建立了直升机旋翼自转着陆过程的仿真模型，给出了全量模型和模型调整过程。
2
Part 2 focuses in more depth on some of the concepts we discuss here and also covers performance tuning in the domain model.
第2部分更深入地讨论这里介绍的一些概念，还要讨论领域模型中的性能调优。
3
With a little attention, though, most Rails applications can be made to perform very well. Model requests often need tuning to reduce the number of database accesses required.
仔细看大多数的Rails应用都执行良好，但是很多 Model 操作都可以经由调校降低对资料库的存取次数。