old field
definitions
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An area of land that was previously used for farming but has been left uncultivated, often undergoing ecological succession with the growth of wild plants.ru: Заброшенное поле
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A subject, area of study, or professional domain that is no longer current, active, or widely researched.ru: Устаревшая область
examples
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The old field was quickly reclaimed by thickets and wildflowers.
Старое поле быстро заросло кустарником и полевыми цветами.
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He realized that his research was focused on an old field of science.
Он понял, что его исследования сосредоточены на устаревшей области науки.