如有不正确的地方请前辈多多指正，此文章仅供参考。
If they are not the right place please predecessors lot of corrections, this article for reference only.
探讨的内容和方向也还有很多幼稚和模糊的地方，请各位老师多多指正。
The discussion content and the direction also have weak and the fuzzy place, asks fellow teachers very much to point out mistakes.
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