Based on the production practice, the original complex model is optimized, realizing an effective control on grinding.

结合生产实际，优化了原有的复杂模型，达到了对磨矿作业的有效控制。

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The most difficult, because as the plot is essentially predetermined, the writer needs skill to keep the momentum going, conjuring up original, complex characters and vivid scene-setting.

说它最困难，是因为故事的情节实际上已经预先设定好了，作家需要使用技巧来让故事向前推进，还要构思出原创的拥有复杂个性的角色与逼真的场景。

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And the Freedom Tower, which will be built on the World Trade Center site, is designed to be taller than the original complex.

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Tracing an attack to its original source can be complex in the extreme, he adds.

BBC: South Korea network attack 'a computer virus'

The IRS seems to be pulling out the stops to encourage more taxpayers to come clean and join its 2011 offshore voluntary disclosure initiative by the Aug. 31, 2011 deadline. (See our original blog detailing the program.) These filings are very complex and have many unintended consequences.

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