With the grey systems, the research on forecast model GM(1,1) of residents′ percapita income in HeBei province gets a forecast accuracy.
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grey-hats hack systems illegally, but with the intention of notifying the system administrator of the flaws in their network.
灰帽黑客，他也非法进入他人系统，但是只是提醒系统管理员他们网络系统有缺陷。
To emphasize expatiating on how the method of grey systems analysis works in the estimation of water-gushing amount of the tunnel, then compare the result with two common methods.
论述了隧道涌水预测的基本原理与方法，并重点结合岩溶地区特殊的地质条件对有关方法进行了阐述。
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