... First derivative，一阶导数 First principal component，第一主成分 First quartile，第一四分位数 ...
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The scores of the first principal component may approximately represent the extent of the outbreaks of pest.
利用第一主分量得分的多少可以近似反映蝗虫的发生程度。
The first principal component of the Southern Oscillation Index (SOI) is used as the intensity of annual SO.
用南方涛动指数(SOI)的第一主成分表示年涛动强度。
They are all initialized by the first principal component for the close relation between principal curves and the principal components.
然而实验发现第一主成分未必是算法初始化的最佳选择。
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