英単語＋例文
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frequency (頻度): She visits her family …
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fright (恐怖): The sudden noise gave her…
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frigid (極寒の): The explorers faced frig…
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frivolous (軽薄な): His frivolous behavio…
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fossilize (化石化する): The remains had fos…
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frugal (倹約な): She leads a frugal lifes…
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founder (創設者): She is the founder of t…
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fruitful (実りのある): Their collaboration …
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foresight (先見の明): His foresight saved …
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forestry (森林学): He studied forestry in…