Samraworld Dictionary
(1)
Noun
An acute disease marked by inflammation of lung tissue, pneumonia is characterized by fever, chills, cough, difficulty in breathing, fatigue, chest pain, and reduced lung expansion, and is typically caused by an infectious agent (such as a bacterium, virus, or fungus)
肺炎は、肺組織の炎症を特徴とする急性疾患で、発熱、悪寒、咳、呼吸困難、疲労、胸の痛み、肺の拡張の低下が特徴で、通常は感染性因子（細菌、ウイルス、真菌など）によって引き起こされます。
Examples
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I was jogging in the rain last week and caught pneumonia.先週、雨の中ジョギングをしていて、肺炎にかかった。