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Results:
principal component : 1）主成分
principal diagonal : 1）主対角線
principal piece : 1）（解剖）主部
principal part : 1）主要部
principal clause : 1）【文法】主節
principal chain : 1）主鎖
principal cell : 1）主細胞
principal food : 1）(the 〜)主食
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principal component

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