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quaternary ammonium base : 1）四級アンモニウム塩基
quaternary ammonium : 1）四級アンモニウム
quaternary structure : 1）四次構造
quaternary carbon : 1）四級炭素
quiet as a mouse : 1）とてもおとなしい、もの静かで、口数のきわめて少ない、二十日鼠のように非常に静かで(cf. as good as gold)
quietly as a mouse : 1）じつにおとなしい
quaternary : 1）四次の 2）第四級の 3）四級の
quarter of a century : 1）(a 〜)四半世紀(25年)
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quaternary ammonium base

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