Because of the gray informations in the selection of highway items, in order to support decision-making, the grey relation to those was adopted to analyze much information.
针对公路建设项目的方案比选中存在诸多的灰色信息，采用灰关联度来诠释这种信息，并支撑决策。
Gray degree relation analysis is advanced according to the grey features of rock body steadiness grading. It is proved scientific, reliable, simple and easy to conduct according to the practical data.
根据岩体稳定性分级的灰色性，提出了岩体稳定性分级的灰色关联分析法，并经实测数据进行验证，说明此方法是科学可靠的，且简单易行。
Of course we say grey series is not only refers to smoke gray, but includes red, yellow, blue, grey ash, ash.
当然我们说的灰色系列不是单指烟灰色，而是包括红灰、蓝灰、黄灰等在内的。
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