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だいたいという意味のroughlyとapproximatelyの使い分けおしえてください!

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あまり違いはないですが、approximatelyは少しフォーマルなイメージがあります。
辞書によるとapproximatelyは工業的、科学的な内容の場合に特に用いられるようです。(大体の数を示す時に用いられる)

ロングマン英英辞典より
approximately・・・more or less than a number or amount - used in technical or scientific contexts

roughly・・・used when you are trying to give someone a general idea of the size, amount, or number of something

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