naturally occurring radioactivity 中文意思是什麼
naturally occurring radioactivity
解釋
天然來源的放射性- naturally : adv. 1. 自然地。2. 生來；天然地。3. 自自然然,不做作地。4. 容易地。5. 當然,不用說。
- occurring : n. 〈美口〉事變，事件，事故。
- radioactivity : 放射活動；放射強度
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Radioactive matter is incorporated into plants, which are then eaten by animals with the result that most foodstuffs have a measurable amount of radioactivity. additional radioactivity in food comes from the naturally occurring isotope carbon 14. some cosmic radiation also reaches sea level
植物亦混有輻射物質，而動物吃掉植物，以致絕大部份食物也含有一定輻射食物輻射也來自天然的同位素碳十四，此外，宇宙輻射亦可穿越大氣層照射到海面。
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