Our ruleof thumb in our books is to show the same code context two or threetimes before switching to just the snippets (although this rule variesgreatly with the type of code).
我们的经验是：把代码放在上下文中出现两三次以后，才开始只展示代码片断（虽然 这条规则随不同的代码有很大变化）。
During the study of the extension of the rule tree, such crucial problems as the rule dead-lock, nodes redundancy and nodes conflict are successfully solved, realizing the automatic switching system.
在对规则树的扩展研究过程中，解决了规则死锁、节点冗余及冲突等关键问题，从而实现了自动开操作票系统。
Based on the optimal control theory, the energy saving control rule, the on-off switching manner, is derived.
在此基础上，根据最佳控制理论，导出了节能控制规律——开关控制。
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