For this purpose, the concepts on grey earthquake intensity, grey classification of site soil, normality degree of the working of structures and grey reliability of structures are defined.

为此，提出了灰色地震烈度，场地灰类、结构工作正常度以及结构灰色可靠度等概念及其计算方法。

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To evaluate the effects of various factors on the stability of rock mass slope, the grey classification together method for space prediction of the rock mass slope stability is put forward.

为评价多种因素对边坡稳定性的影响，提出了岩体边坡稳定性灰色聚类空间预测方法。

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By using grey classification analysis method, chapter 5 classifies the recent several years' effectiveness of QingChuan shipping company's SMS respectively and give a quantitative evaluation.

第五章运用了灰色聚类分析，对晴川轮船公司近几年来安全管理体系的有效性分别进行了聚类，作出了一个定量的评估。

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Besides requiring astronomers to dream up a new mnemonic for their stellar classification, the existence of a grey area between stars and planets reveals the extent to which the processes of planetary and stellar formation are still a mystery.

ECONOMIST: Twinkle, twinkle, giant planet