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Unfortunately, its simplicity is also its weakness since it is frequently too simple to represent realistic problems.
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今夜无法入睡,只因怕,与你在梦中再相遇........ |
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花开了,树绿了,蝴蝶飞来了,蜜蜂恋爱了~~~
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发表于 2007-8-10 11:19
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