因为Google文字搜索结果是按照广告主支付的PPC价格来排序的。
Because the text results are based on an advertiser's prices in PPC ads.
目前学术界对土地等级评价所使用的主要方法有：主成分分析法、回归分析法、灰色关联度分析法、特尔斐法、排序法、层次分析法、模糊综合评价法。
These methods include the Principle component analysis, the Regression analysis, the Grey cognate analysis, the Delphi, the Ordering method, the Analytical Hierarchy Process, Fuzzy method.
用主成分分析排序法分析准噶尔盆地沙漠植被的多元特征。
The principal composition analysis (PCA) was used to study the multivariate characteristics of desert vegetation in Junnger Basin.
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