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Results:
principal clause : 1）【文法】主節
principal chain : 1）主鎖
principal value : 1）主値
principal piece : 1）（解剖）主部
principal cell : 1）主細胞
principal part : 1）主要部
principal parts : 1）動詞の基本活用形（英語では言在形（不定詞形）・過去形・過去分詞形）
principal boy : 1）パントマイムで主役をつとめる俳優
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principal clause

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