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1.The scientist used a radioactive substance to study the properties of matter.
科学家使用放射性物质来研究物质的性质。
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2. Radiation is a form of energy that can cause harm to living organisms.
辐射是一种能量形式，可以对活体生物造成伤害。
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3.The radiation from the sun affects the earth's climate.
太阳的辐射影响地球的气候。