The current operation manner of the power system is complicated and changes frequently, causing great difficulty in the analysis of operation of relay protection.
目前电力系统的运行方式复杂、变化频繁，给继电保护的运行分析带来很大的困难。
That's kind of a complicated question, because you do want to have q good manner, automatically, at the end of theday, the patient is number one.
这是一个比较复杂的问题，因为你确实想保持好的礼貌教养，毕竟一天结束的时候，病人总是第一位的。
We cannot expect to resolve the complicated global problems overnight. Instead, we need to work out plans in a phased manner appropriate to the national conditions of respective countries.
许多全球性问题的背景复杂，解决起来不可能一蹴而就，解决方案也必须根据各自国情逐步探索。
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