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Heatstroke, a condition caused by the body overheating due to prolonged exposure to high temperatures, often accompanied by dehydration.
他在烈日下工作三小时后出现头晕、恶心，医生诊断为中暑。
After working three hours under the scorching sun, he felt dizzy and nauseous; the doctor diagnosed him with heatstroke.
Often occurs during heat waves; immediate cooling and hydration are essential.