Nobody had expected that ____________________ (这样的悲剧会发生在他身上). (happen to)
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A man can finish his shopping for clothes quickly if everything goes well.
若开环系统是稳定的,即位于S平面的右半部的开环极点数p=0,则闭环系统稳定的充要条件是:当ω由-∞变到+∞时,开环频率特性包围(-1,j0)点0圈。
The team tried hard to apply for government funds, ____________________ (却发现他们必须自己克服财政困难). (only to find; overcome)