Have you ever noticed how the smell in the air changes as it starts to rain? The refreshing scent that appears during rain has a scientific name: petrichor. It is a unique, earthy smell that many people find calming and nostalgic. This scent primarily comes from a natural compound called geosmin, which is produced by certain bacteria that grow in warm, damp soil. These bacteria release geosmin as part of their life cycle, and the compound builds up in the soil during dry periods.
你有沒有注意過，當開始下雨時，空氣中的氣味會發生變化？這種在下雨時出現的清新氣味有一個科學名稱：petrichor。它是一種獨特的泥土味，許多人認為這種味道讓人感到放鬆且充滿念舊之情。這種氣味主要來自一種叫作土臭素的天然化合物，它是由某種生長在溫暖潮溼土壤中的細菌所產生的。這些細菌在其生命週期中會釋放土臭素，在乾燥的時節，這種化合物會在土壤中累積。
生活必備字詞：
natural a. 自然的
naturally adv. 自然地
damp a. 潮溼的
release vt. 釋出
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本文節錄自《常春藤生活英語》雜誌，完整內容請見三月號。
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