... 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。
The results show temperature spatial variations have high consistency, the variance ratio contribution of the first principal component is about 75%.
结果表明：祁连山附近气温在空间上具有很好的一致性，年平均气温的第一主成分的方差贡献可占总方差的75%左右。
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